Novel substituted quinoline-8-carbonitrile derivatives having androgen receptor degradation activity and uses thereof

ABSTRACT

The present disclosure relates to novel compounds, pharmaceutical compositions containing such compounds, and their use in prevention and treatment of cancer and related diseases and conditions. In some embodiments, the compounds disclosed herein exhibit androgen receptor degradation activity.

This application claims priority from U.S. Provisional Patent Application No. 62/904,007, filed Sep. 23, 2019, which is hereby incorporated by reference in its entirety.

FIELD OF THE DISCLOSURE

The present disclosure relates to novel compounds, pharmaceutical compositions containing such compounds, and their use in prevention and treatment of diseases and conditions, e.g., cancer. The compounds disclosed herein exhibit androgen receptor degradation activity.

BACKGROUND OF THE DISCLOSURE

Androgens, through binding to the Androgen Receptor (AR), govern a wide range of physiological processes. For example, androgens are required for normal prostate development and function as they are key in the AR signaling pathway. Unfortunately, the AR signaling pathway is also implicated in the development and survival of cancers, such as prostate, breast, and other cancers (see, e.g., “Androgen Receptor in Prostate Cancer”, Endocrine Reviews, 2004, 25(2), 276-308; and “Androgen receptors beyond prostate cancer: an old marker as a new target”, Oncotarget, 2014, 6(2), 592-603).

Traditional methods to treat cancers where AR is implicated, such as prostate cancer, involves AR signaling suppression through, for example, androgen deprivation therapy. Such therapy includes chemical and/or surgical castration. Alternatively, anti-androgen therapy may be pursued, whereby a patient is treated with an AR inhibitor, such as enzalutamide (XTANDI®). Although these treatment methods have resulted in improved prognoses for individuals with androgen receptor positive cancer, cancer progression is eventually observed and occurs through, for example, AR gene amplification and/or development of AR mutations.

Accordingly, there exists a need to treat AR positive cancer that halts progression of the cancer, even if the individual has experienced one or more prior therapies. One approach to achieve this goal would be to utilize the naturally occurring cellular ubiquitin-mediated degradation. Without being bound to any theory, it is believed that AR degradation may occur when both AR and a ubiquitin ligase are bound and brought into close proximity.

Cereblon (“CRBN”) E3 ubiquitin ligase is a ubiquitin ligase that forms an E3 ubiquitin ligase complex with damaged DNA binding protein 1 and Cullin 4. It functions as a substrate receptor by bringing the substrates to close proximity for ubiquitination and subsequent degradation by proteasomes. Recently, it has been discovered that small molecules drugs, e.g., thalidomide and its close analogs, lenalidomide and pomalidomide, can simultaneously interact with CRBN and some other proteins. In doing so, CRBN may be exploited for target protein degradation, such as IKZF1 and IKZF3. This is thought to account for the anti-myeloma effects of thalidomide and related compounds.

Thus, disclosed herein are compounds useful for the treatment of cancers, such as prostate cancer. In some instances, the cancer is AR positive. The compounds disclosed herein are bifunctional molecules, where one portion of the molecule is capable of interacting with CRBN and the other portion, which is linked to the CRBN-interacting portion of the molecule via a linking moiety, is capable of interacting with AR.

SUMMARY OF THE DISCLOSURE

In some embodiments, the present disclosure is directed to a compound of Formula (1), or a pharmaceutically acceptable salt thereof:

wherein:

X₁ is CR₁ or N;

X₂ is CR₂ or N;

X₃ is CR₃ or N;

X₄ is CR₄ or N;

each of R₁, R₂, R₃, and R₄ is independently selected from hydrogen, halogen, C₁-C₃alkoxy, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S);

each R₅ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN, each of which is substituted with 0, 1, 2, or 3 R_(S);

each R₆ is independently selected from hydrogen, halogen, C₁-C₃alkyl, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₆ groups are taken together to form an oxo;

each R₇ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN, each of which is substituted with 0, 1, 2, or 3 R_(S);

each R₈ is independently selected from hydrogen, hydroxyl, C₁-C₃alkyl, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₈ groups are taken together to form an oxo;

each R₉ is independently selected from hydrogen, C₁-C₃alkyl, —C(═O)—(C₁-C₃alkyl), —C(═O)—O—(C₁-C₃alkyl), and —C(═O)—NH—(C₁-C₃alkyl), each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₉ groups are taken together to form a 3- to 6-membered heterocycle or heteroaryl;

each R_(S) is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN;

L is a linker of 1 to 16 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S);

m is 0, 1, or 2;

n is 0, 1, 2, or 3; and

o is 0, 1, 2, or 3,

wherein each hydrogen atom is independently and optionally replaced by a deuterium atom.

In some embodiments, the compound of Formula (1) may be a compound of Formula (1A)

In some embodiments, the

group may be selected from

In some embodiments, the

group may be selected from

In some embodiments, the

group may be selected from

In some embodiments, L may be selected from:

Also disclosed herein is a method of treating cancer, in a subject in need thereof, comprising administering to said subject a compound of Formula (1) (e.g. Formula (1A)) or pharmaceutically acceptable salt thereof, or a pharmaceutical composition comprising a compound of Formula (1) or a pharmaceutically acceptable salt thereof. In at least one embodiment, the pharmaceutical composition of the present disclosure may be for use in (or in the manufacture of medicaments for) the treatment of cancer in the subject in need thereof.

In at least one embodiment, a therapeutically-effective amount of a pharmaceutical composition of the present disclosure may be administered to a subject diagnosed with cancer. In some embodiments, the cancer is selected from prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer.

BRIEF DESCRIPTION OF THE FIGURES

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the disclosed embodiments and, together with the description, explain the principles of the disclosed embodiments. In the drawings:

FIG. 1 illustrates the androgen receptor (AR) degradative activity of compounds 2-22 and 2-32 in LNCAP cell lines 24 hours after administration using Western blot analysis.

DETAILED DESCRIPTION OF THE DISCLOSURE Definitions

As used herein, “cancer” refers to diseases, disorders, and conditions that involve abnormal cell growth with the potential to invade or spread to other parts of the body. Exemplary cancers include, but are not limited to, prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer.

As used herein, the term “androgen receptor positive” means that androgen receptor is detected by one or more analytical methods, e.g., immunohistochemistry. For example, analysis of a biopsy of a subject's tumor may indicate the presence of androgen receptor. AR status may be tested by circulating cancer cells or circulating tumor DNA in a blood test. In some circumstances an AR test may not be performed.

“Subject” refers to an animal, such as a mammal, that has been or will be the object of treatment, observation, or experiment. The methods described herein may be useful for both human therapy and veterinary applications. In one embodiment, the subject is a human.

As used herein, “treatment” or “treating” refers to an amelioration of a disease or disorder, or at least one discernible symptom thereof. In another embodiment, “treatment” or “treating” refers to an amelioration of at least one measurable physical parameter, not necessarily discernible by the patient. In yet another embodiment, “treatment” or “treating” refers to inhibiting the progression of a disease or disorder, either physically, e.g., stabilization of a discernible symptom, physiologically, e.g., stabilization of a physical parameter, or both. In yet another embodiment, “treatment” or “treating” refers to delaying the onset of a disease or disorder.

A dash (“-”) that is not between two letters or symbols is used to indicate a point of attachment for a substituent. For example, —CN is attached through the carbon atom.

By “optional” or “optionally” it is meant that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event or circumstance occurs and instances in which is does not. It will be understood by those skilled in the art, with respect to any group containing one or more substituents, that such groups are not intended to introduce any substitution or substitution patterns that are sterically impractical, synthetically non-feasible and/or inherently unstable.

When a range of values is listed, it is intended to encompass each value and sub-range within the range. For example, “C₁-C₆ alkyl” is intended to encompass C₁, C₂, C₃, C₄, C₅, C₆, C₁₋₆, C₁₋₅, C₁₋₄, C₁₋₃, C₁₋₂, C₂₋₆, C₂₋₅, C₂₋₄, C₂₋₃, C₃₋₆, C₃₋₅, C₃₋₄, C₄₋ ₆, C₄₋₅, and C₅₋₆ alkyl.

The term “alkenyl” as used herein refers to an unsaturated, two-carbon group having a carbon-carbon double bond, referred to herein as C₂-alkenyl.

The term “alkoxy” as used herein refers to an alkyl or cycloalkyl covalently bonded to an oxygen atom.

The term “alkyl” as used herein refers to a saturated straight or branched hydrocarbon, such as a straight or branched group of 1-8 carbon atoms, referred to herein as (C₁-C₈)alkyl. Exemplary alkyl groups include, but are not limited to, methyl, ethyl, propyl, isopropyl, 2-methyl-1-propyl, 2-methyl-2-propyl, 2-methyl-1-butyl, 3-methyl-1-butyl, 2-methyl-3-butyl, 2,2-dimethyl-1-propyl, 2-methyl-1-pentyl, 3-methyl-1-pentyl, 4-methyl-1-pentyl, 2-methyl-2-pentyl, 3-methyl-2-pentyl, 4-methyl-2-pentyl, 2,2-dimethyl-1-butyl, 3,3-dimethyl-1-butyl, 2-ethyl-1-butyl, butyl, isobutyl, t-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, and octyl. In some embodiments, “alkyl” is a straight-chain hydrocarbon. In some embodiments, “alkyl” is a branched hydrocarbon.

The term “alkynyl” as used herein refers to an unsaturated, two-carbon group having a carbon-carbon triple bond, referred to herein as C₂-alkynyl.

The term “aryl” as used herein refers to a mono-, bi-, or other multi-carbocyclic, aromatic ring system with 5 to 14 ring atoms. The aryl group can optionally be fused to one or more rings selected from aryls, cycloalkyls, heteroaryls, and heterocyclyls. The aryl groups of this present disclosure can be substituted with groups selected from alkoxy, aryloxy, alkyl, alkenyl, alkynyl, amide, amino, aryl, arylalkyl, carbamate, carboxy, cyano, cycloalkyl, ester, ether, formyl, halogen, haloalkyl, heteroaryl, heterocyclyl, hydroxyl, ketone, nitro, phosphate, sulfide, sulfinyl, sulfonyl, sulfonic acid, sulfonamide, and thioketone. Exemplary aryl groups include, but are not limited to, phenyl, tolyl, anthracenyl, fluorenyl, indenyl, azulenyl, and naphthyl, as well as benzo-fused carbocyclic moieties such as 5,6,7,8-tetrahydronaphthyl. Exemplary aryl groups also include but are not limited to a monocyclic aromatic ring system, wherein the ring comprises 6 carbon atoms, referred to herein as “C$-aryl.”

The term “cycloalkyl” as used herein refers to a saturated or unsaturated cyclic, bicyclic, or bridged bicyclic hydrocarbon group of 3-16 carbons, or 3-8 carbons, referred to herein as “(C₃-C₈)cycloalkyl,” derived from a cycloalkane. Exemplary cycloalkyl groups include, but are not limited to, cyclohexanes, cyclohexenes, cyclopentanes, and cyclopentenes. Cycloalkyl groups may be substituted with alkoxy, aryloxy, alkyl, alkenyl, alkynyl, amide, amino, aryl, arylalkyl, carbamate, carboxy, cyano, cycloalkyl, ester, ether, formyl, halogen, haloalkyl, heteroaryl, heterocyclyl, hydroxyl, ketone, nitro, phosphate, sulfide, sulfinyl, sulfonyl, sulfonic acid, sulfonamide and thioketone. Cycloalkyl groups can be fused to other cycloalkyl (saturated or partially unsaturated), aryl, or heterocyclyl groups, to form a bicycle, tetracycle, etc. The term “cycloalkyl” also includes bridged and spiro-fused cyclic structures which may or may not contain heteroatoms.

The terms “halo” or “halogen” as used herein refer to —F, —Cl, —Br, and/or —I.

The term “haloalkyl group” as used herein refers to an alkyl group substituted with one or more halogen atoms.

The term “heteroaryl” as used herein refers to a mono-, bi-, or multi-cyclic, aromatic ring system containing one or more heteroatoms, for example 1-4 heteroatoms, such as nitrogen, oxygen, and sulfur. Heteroaryls can be substituted with one or more substituents including alkoxy, aryloxy, alkyl, alkenyl, alkynyl, amide, amino, aryl, arylalkyl, carbamate, carboxy, cyano, cycloalkyl, ester, ether, formyl, halogen, haloalkyl, heteroaryl, heterocyclyl, hydroxyl, ketone, nitro, phosphate, sulfide, sulfinyl, sulfonyl, sulfonic acid, sulfonamide and thioketone. Heteroaryls can also be fused to non-aromatic rings. Illustrative examples of heteroaryl groups include, but are not limited to, pyridinyl, pyridazinyl, pyrimidyl, pyrazyl, triazinyl, pyrrolyl, pyrazolyl, imidazolyl, (1,2,3)- and (1,2,4)-triazolyl, pyrazinyl, pyrimidilyl, tetrazolyl, furyl, thienyl, isoxazolyl, thiazolyl, furyl, phenyl, isoxazolyl, and oxazolyl. Exemplary heteroaryl groups include, but are not limited to, a monocyclic aromatic ring, wherein the ring comprises 2-5 carbon atoms and 1-3 heteroatoms, referred to herein as “(C₂-C₅)heteroaryl.” In some embodiments, a heteraryl contains 5 to 10 ring atoms, 1 to 4 of which are heteroatoms selected from N, O, and S. In some embodiments, a heteroaryl contains 5 to 8 ring atoms, 1 to 4 of which are heteroatoms selected from N, O, and S.

The terms “heterocycle,” “heterocyclyl,” or “heterocyclic” as used herein each refer to a saturated or unsaturated 3- to 18-membered ring containing one, two, three, or four heteroatoms independently selected from nitrogen, oxygen, phosphorus, and sulfur. Heterocycles can be aromatic (heteroaryls) or non-aromatic. Heterocycles can be substituted with one or more substituents including alkoxy, aryloxy, alkyl, alkenyl, alkynyl, amide, amino, aryl, arylalkyl, carbamate, carboxy, cyano, cycloalkyl, ester, ether, formyl, halogen, haloalkyl, heteroaryl, heterocyclyl, hydroxyl, ketone, nitro, phosphate, sulfide, sulfinyl, sulfonyl, sulfonic acid, sulfonamide and thioketone. Heterocycles also include bicyclic, tricyclic, and tetracyclic groups in which any of the above heterocyclic rings is fused to one or two rings independently selected from aryls, cycloalkyls, and heterocycles. Exemplary heterocycles include acridinyl, benzimidazolyl, benzofuryl, benzothiazolyl, benzothienyl, benzoxazolyl, biotinyl, cinnolinyl, dihydrofuryl, dihydroindolyl, dihydropyranyl, dihydrothienyl, dithiazolyl, furyl, homopiperidinyl, imidazolidinyl, imidazolinyl, imidazolyl, indolyl, isoquinolyl, isothiazolidinyl, isothiazolyl, isoxazolidinyl, isoxazolyl, morpholinyl, oxadiazolyl, oxazolidinyl, oxazolyl, piperazinyl, piperidinyl, pyranyl, pyrazolidinyl, pyrazinyl, pyrazolyl, pyrazolinyl, pyridazinyl, pyridyl, pyrimidinyl, pyrimidyl, pyrrolidinyl, pyrrolidin-2-onyl, pyrrolinyl, pyrrolyl, quinolinyl, quinoxaloyl, tetrahydrofuryl, tetrahydroisoquinolyl, tetrahydropyranyl, tetrahydroquinolyl, tetrazolyl, thiadiazolyl, thiazolidinyl, thiazolyl, thienyl, thiomorpholinyl, thiopyranyl, and triazolyl. In some embodiments, a heterocycle contains 5 to 10 ring atoms, 1 to 4 of which are heteroatoms selected from N, O, and S. In some embodiments, a heterocycle contains 5 to 8 ring atoms, 1 to 4 of which are heteroatoms selected from N, O, and S.

The terms “hydroxy” and “hydroxyl” as used herein refer to —OH.

The term “oxo” as used herein refers to a double bond to an oxygen atom (i.e., ═O). For example, when two geminal groups on a carbon atom are “taken together to form an oxo”, then a carbonyl (i.e., C═O) is formed.

The term “pharmaceutically acceptable carrier” as used herein refers to any and all solvents, dispersion media, coatings, isotonic and absorption delaying agents, and the like, that are compatible with pharmaceutical administration. The use of such media and agents for pharmaceutically active substances is well known in the art. The compositions may also contain other active compounds providing supplemental, additional, or enhanced therapeutic functions.

As used herein, the term “pharmaceutically acceptable salt” refers to a salt form of a compound of this disclosure wherein the salt is nontoxic. Pharmaceutically acceptable salts of the compounds of this disclosure include those derived from suitable inorganic and organic acids and bases. A “free base” form of a compound, for example, does not contain an ionically bonded salt.

The phrase “and pharmaceutically acceptable salts and deuterated derivatives thereof” is used interchangeably with “and pharmaceutically acceptable salts thereof and deuterated derivatives of any of the forgoing” in reference to one or more compounds or formulae of the disclosure. These phrases are intended to encompass pharmaceutically acceptable salts of any one of the referenced compounds, deuterated derivatives of any one of the referenced compounds, and pharmaceutically acceptable salts of those deuterated derivatives.

One of ordinary skill in the art would recognize that, when an amount of “a compound or a pharmaceutically acceptable salt thereof” is disclosed, the amount of the pharmaceutically acceptable salt form of the compound is the amount equivalent to the concentration of the free base of the compound. It is noted that the disclosed amounts of the compounds or their pharmaceutically acceptable salts thereof herein are based upon their free base form.

Suitable pharmaceutically acceptable salts are, for example, those disclosed in S. M. Berge, et al. J. Pharmaceutical Sciences, 1977, 66, 1-19. For example, Table 1 of that article provides the following pharmaceutically acceptable salts:

TABLE 1 Acetate Iodide Benzathine Benzenesulfonate Isethionate Chloroprocaine Benzoate Lactate Choline Bicarbonate Lactobionate Diethanolamine Bitartrate Malate Ethylenediamine Bromide Maleate Meglumine Calcium edetate Mandelate Procaine Camsylate Mesylate Aluminum Carbonate Methylbromide Calcium Chloride Methylnitrate Lithium Citrate Methylsulfate Magnesium Dihydrochloride Mucate Potassium Edetate Napsylate Sodium Edisylate Nitrate Zinc Estolate Pamoate (Embonate) Esylate Pantothenate Fumarate Phosphate/diphosphate Gluceptate Poygalacuronate Gluconate Salicylate Glutamate Stearate Glycollylarsanilate Subacetate Hexylresorcinate Succinate Hydrabamine Sulfate Hydrobromide Tannate Hydrochloride Tartrate Hydroxynaphthoate Teociate Triethiodide

Non-limiting examples of pharmaceutically acceptable acid addition salts include: salts formed with inorganic acids, such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid, or perchloric acid; salts formed with organic acids, such as acetic acid, oxalic acid, maleic acid, tartaric acid, citric acid, succinic acid or malonic acid; and salts formed by using other methods used in the art, such as ion exchange. Non-limiting examples of pharmaceutically acceptable salts include adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bisulfate, borate, butyrate, camphorate, camphorsulfonate, citrate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate, glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate, hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate, lauryl sulfate, malate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate, pamoate, pectinate, persulfate, 3-phenylpropionate, phosphate, picrate, pivalate, propionate, stearate, succinate, sulfate, tartrate, thiocyanate, p-toluenesulfonate, undecanoate, and valerate salts. Pharmaceutically acceptable salts derived from appropriate bases include alkali metal, alkaline earth metal, ammonium, and N⁺(C₁₋₄alkyl)₄ salts. This disclosure also envisions the quaternization of any basic nitrogen-containing groups of the compounds disclosed herein. Suitable non-limiting examples of alkali and alkaline earth metal salts include sodium, lithium, potassium, calcium, and magnesium. Further non-limiting examples of pharmaceutically acceptable salts include ammonium, quaternary ammonium, and amine cations formed using counterions such as halide, hydroxide, carboxylate, sulfate, phosphate, nitrate, lower alkyl sulfonate and aryl sulfonate. Other suitable, non-limiting examples of pharmaceutically acceptable salts include besylate and glucosamine salts.

As used herein, nomenclature for compounds including organic compounds, can be given using common names, IUPAC, IUBMB, or CAS recommendations for nomenclature. One of skill in the art can readily ascertain the structure of a compound if given a name, either by systemic reduction of compound structure using naming conventions, or by commercially available software, such as CHEMDRAW™ (Cambridgesoft Corporation, U.S.A.).

The compounds of the disclosure may contain one or more chiral centers and/or double bonds and, therefore, exist as stereoisomers, such as geometric isomers, enantiomers or diastereomers. The term “stereoisomers” when used herein consist of all geometric isomers, enantiomers or diastereomers. These compounds may be designated by the symbols “R” or “S,” depending on the configuration of substituents around the stereogenic carbon atom. The present disclosure encompasses various stereoisomers of these compounds and mixtures thereof. Stereoisomers include enantiomers and diastereomers. Mixtures of enantiomers or diastereomers may be designated “(±)” in nomenclature, but the skilled artisan will recognize that a structure may denote a chiral center implicitly. In some embodiments, an enantiomer or stereoisomer may be provided substantially free of the corresponding enantiomer.

In some embodiments, the compound is a racemic mixture of (S)- and (R)-isomers. In other embodiments, provided herein is a mixture of compounds wherein individual compounds of the mixture exist predominately in an (S)- or (R)-isomeric configuration. For example, the compound mixture has an (S)-enantiomeric excess of greater than about 55%, about 60%, about 65%, about 70%, about 75%, about 80%, about 85%, about 90%, about 95%, about 96%, about 97%, about 98%, about 99%, about 99.5%, or more. In other embodiments, the compound mixture has an (S)-enantiomeric excess of greater than about 55% to about 99.5%, greater than about 60% to about 99.5%, greater than about 65% to about 99.5%, greater than about 70% to about 99.5%, greater than about 75% to about 99.5%, greater than about 80% to about 99.5%, greater than about 85% to about 99.5%, greater than about 90% to about 99.5%, greater than about 95% to about 99.5%, greater than about 96% to about 99.5%, greater than about 97% to about 99.5%, greater than about 98% to greater than about 99.5%, greater than about 99% to about 99.5%, or more. In other embodiments, the compound mixture has an (R)-enantiomeric purity of greater than about 55%, about 60%, about 65%, about 70%, about 75%, about 80%, about 85%, about 90%, about 95%, about 96%, about 97%, about 98%, about 99%, about 99.5% or more. In some other embodiments, the compound mixture has an (R)-enantiomeric excess of greater than about 55% to about 99.5%, greater than about 60% to about 99.5%, greater than about 65% to about 99.5%, greater than about 70% to about 99.5%, greater than about 75% to about 99.5%, greater than about 80% to about 99.5%, greater than about 85% to about 99.5%, greater than about 90% to about 99.5%, greater than about 95% to about 99.5%, greater than about 96% to about 99.5%, greater than about 97% to about 99.5%, greater than about 98% to greater than about 99.5%, greater than about 99% to about 99.5% or more.

Individual stereoisomers of compounds of the present disclosure can be prepared synthetically from commercially available starting materials that contain asymmetric or stereogenic centers, or by preparation of racemic mixtures followed by resolution methods well known to those of ordinary skill in the art. These methods of resolution are exemplified by: (1) attachment of a mixture of enantiomers to a chiral auxiliary, separation of the resulting mixture of diastereomers by recrystallization or chromatography and liberation of the optically pure product from the auxiliary; (2) salt formation employing an optically active resolving agent; or (3) direct separation of the mixture of optical enantiomers on chiral chromatographic columns. Stereoisomeric mixtures can also be resolved into their component stereoisomers by well-known methods, such as chiral-phase gas chromatography, chiral-phase high performance liquid chromatography, crystallizing the compound as a chiral salt complex, or crystallizing the compound in a chiral solvent. Stereoisomers can also be obtained from stereomerically-pure intermediates, reagents, and catalysts by well-known asymmetric synthetic methods.

Geometric isomers can also exist in the compounds of the present disclosure. The present disclosure encompasses the various geometric isomers and mixtures thereof resulting from the arrangement of substituents around a carbon-carbon double bond or arrangement of substituents around a carbocyclic ring. Substituents around a carbon-carbon double bond are designated as being in the “Z” or “E” configuration wherein the terms “Z” and “E” are used in accordance with IUPAC standards. Unless otherwise specified, structures depicting double bonds encompass both the E and Z isomers.

Substituents around a carbon-carbon double bond alternatively can be referred to as “cis” or “trans,” where “cis” represents substituents on the same side of the double bond and “trans” represents substituents on opposite sides of the double bond. The arrangements of substituents around a carbocyclic ring are designated as “cis” or “trans.” The term “cis” represents substituents on the same side of the plane of the ring and the term “trans” represents substituents on opposite sides of the plane of the ring. Mixtures of compounds wherein the substituents are disposed on both the same and opposite sides of plane of the ring are designated “cis/trans.”

The compounds disclosed herein may exist as tautomers and both tautomeric forms are intended to be encompassed by the scope of the present disclosure, even if only one tautomeric structure is depicted.

Additionally, unless otherwise stated, structures described herein are also meant to include compounds that differ only in the presence of one or more isotopically enriched atoms. For example, compounds having the present structures except for the replacement of hydrogen by deuterium (²H) or tritium (³H), or the replacement of a carbon by a ¹³C- or ¹⁴C-carbon atom are within the scope of this disclosure. Such compounds may be useful as, for example, analytical tools, probes in biological assays, or therapeutic agents.

Compounds

In some embodiments, provided herein are compounds of Formula (1), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, and deuterated derivatives of any of the foregoing:

wherein:

X₁ is CR₁ or N;

X₂ is CR₂ or N;

X₃ is CR₃ or N;

X₄ is CR₄ or N;

each of R₁, R₂, R₃, and R₄ is independently selected from hydrogen, halogen, C₁-C₃alkoxy, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S);

each R₅ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN, each of which is substituted with 0, 1, 2, or 3 R_(S);

each R₆ is independently selected from hydrogen, halogen, C₁-C₃alkyl, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₆ groups are taken together to form an oxo;

each R₇ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN, each of which is substituted with 0, 1, 2, or 3 R_(S);

each R₈ is independently selected from hydrogen, hydroxyl, C₁-C₃alkyl, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₈ groups are taken together to form an oxo;

each R₉ is independently selected from hydrogen, C₁-C₃alkyl, —C(═O)—(C₁-C₃alkyl), —C(═O)—O—(C₁-C₃alkyl), and —C(═O)—NH—(C₁-C₃alkyl), each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₉ groups are taken together to form a 3- to 6-membered heterocycle or heteroaryl;

each R_(S) is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN;

L is a linker of 1 to 16 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S);

m is 0, 1, or 2;

n is 0, 1, 2, or 3; and

o is 0, 1, 2, or 3.

In some embodiments, the compound of Formula (1) may be a compound of Formula (1A)

In some embodiments, X₁ is N. In some embodiments, X₂ is N. In some embodiments, X₁ and X₂ are each N. In some embodiments, X₂ is CR₂, X₃ is CR₃, and X₄ is CR₄. In some embodiments, R₂, R₃, and R₄ are each independently selected from H and F. In some embodiments, X₂ is CR₂, X₃ is CR₃, X₄ is CR₄, and R₂, R₃, and R₄ are each independently selected from H and F. In some embodiments, X₁ is CR₁, X₂ is CR₂, X₃ is CR₃, and X₄ is CR₄. In some embodiments, R₁, R₂, R₃, and R₄ are each independently selected from H and F. In some embodiments, X₁ is CR₁, X₂ is CR₂, X₃ is CR₃, and X₄ is CR₄, and R₁, R₂, R₃, and R₄ are each independently selected from H and F.

In some embodiments, R₁ is F. In some embodiments, R₂ is F. In some embodiments, R₃ is F. In some embodiments, R₄ is F. In some embodiments, R₁ and R₃ are each F. In some embodiments, R₃ and R₄ are each F. In some embodiments, R₂, R₃, and R₄ are each H. In some embodiments, R₁, R₃, and R₄ are each H. In some embodiments, R₁, R₂, and R₄ are each H. In some embodiments, R₁, R₂, and R₃ are each H. In some embodiments, R₂ and R₄ are each H. In some embodiments, R₁ and R₂ are each H.

In some embodiments, the

group is selected from

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, each R₅ is independently selected from halogen, C₁-C₃alkoxy, and C₁-C₃haloalkyl. In some embodiments, each R₅ is independently selected from —Cl, —OCH₃, and —CF₃.

In some embodiments, m is 0 or 1. In some embodiments, m is 0. In some embodiments, m is 1.

In some embodiments, o is 0 or 1. In some embodiments, o is 0. In some embodiments, o is 1.

In some embodiments, m and o are each 0.

In some embodiments, each R₆ is independently selected from H and Cr C₃alkyl. In some embodiments, each R₆ is independently selected from H and —CH₃. In some embodiments, one R₆ is H and the other R₆ is —CH₃. In some embodiments, each R₆ is identical. In some embodiments, each R₆ is different.

In some embodiments, the group

is selected from

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

is selected from

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, the group

In some embodiments, each R₇ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, and C₁-C₃haloalkyl. In some embodiments, each R₇ is independently selected from halogen, hydroxyl, —CH₃, and —CF₃. In some embodiments, each R₇ is independently selected from F, hydroxyl, —CH₃, and —CF₃. In some embodiments, each R₇ is independently F.

In some embodiments, n is 0. In some embodiments, n is 1.

In some embodiments, each R₈ is hydrogen or two R₈ groups are taken together to form an oxo. In some embodiments, each R₈ is hydrogen. In some embodiments, two R₈ groups are taken together to form an oxo.

In some embodiments, the

group is

In some embodiments, the

group is selected from

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, the

group is

In some embodiments, each R₉ is independently selected from hydrogen, C₁-C₃alkyl, and —C(═O)—C₁-C₃alkyl. In some embodiments, each R₉ is independently selected from hydrogen and C₁-C₃alkyl. In some embodiments, each R₉ is independently selected from hydrogen, —CH₃, —CH₂CH₃, and —CH(CH₃)₂.

In some embodiments, L is a linker of 1 to 12 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S). In some embodiments, L is a linker of 1 to 10 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S). In some embodiments, L is a linker of 1 to 8 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S). In some embodiments, L is a linker of 1 to 6 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S).

In some embodiments, one or more carbon atoms of linker L are optionally replaced by C(═O), O, N(R₉), S, cycloalkyl, aryl, heterocycle, or heteroaryl. In some embodiments, one or more carbon atoms of linker L are optionally replaced by O, N(R₉), cycloalkyl, or heterocycle, wherein the R₉, cycloalkyl, and heterocycle are each independently substituted with 0, 1, 2, or 3 R_(S). In some embodiments, at least one carbon atom of linker L is replaced by a heterocycle, which is substituted with 0, 1, 2, or 3 R_(S). In some embodiments, at least two carbon atoms of linker L are replaced by a heterocycle, each of which is substituted with 0, 1, 2, or 3 R_(S).

In some embodiments, the heterocycle in L is selected from piperidine and piperazine, each of which is substituted with 0, 1, 2, or 3 R_(S). In some embodiments, the heterocycle in L is selected from

In some embodiments, L is selected from:

In some embodiments, provided herein is a pharmaceutically acceptable salt of a compound of Formula (1). In some embodiments, provided herein is a deuterated derivative of a pharmaceutically acceptable salt of a compound of Formula (1). In some embodiments, provided herein is a compound of Formula (1). In some embodiments, provided herein is a compound of Formula (1A).

In some embodiments, provided herein is a compound chosen from the compounds listed in Table 2 or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing.

TABLE 2 Exemplary Compounds of the Present Disclosure Refer- ence Num- # Structure & Name ber 1

2-1 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-((5-((2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)pentyl)oxy)benzamide 2

2-2 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(3-(3-((2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)propoxy)propoxy)benzamide 3

2-3 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(2-(4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethoxy)benzamide 4

2-4 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl), 4-(3-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)propoxy)benzamide 5

2-5 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-(4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)butoxy)benzamide 6

2-6 N-((1r,3r)-3-((8-cyanoquinolin-5-yloxy)-2,2,4,4-tetramethylcyclobutyl)-4-((5-(4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)pentyl)oxy)benzamide 7

2-7 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)nicotinamide 8

2-8 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)oxy)cyclobutyl)(methyl)amino)butoxy)benzamide 9

2-9 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1r,3r)-3- ((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinamide 10

2-10 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1r,3r)-3-((2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)oxy)cyclobutyl)(ethyl)amino)methyl)piperidin-1-yl)nicotinamide 11

2-11 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1r,3r)-3- ((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinamide 12

2-12 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1s,3s)- 3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinamide 13

2-13 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl-6-(4-((4- (2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)nicotinamide 14

2-14 N-((1S,3S)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,-dimethylcyclobutyl)-6-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)nicotinamide 15

2-15 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)cyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin- 3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinamide 16

2-16 N-((1s,3s)-3-((8-cyanoquinolin-5-yl)oxy)cyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)- 1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinamide 17

2-17 N-((1S,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2-dimethylcyclobutyl)-6-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)nicotinamide 18

2-18 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4-((4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)pyrimidine- 5-carboxamide 19

2-19 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1- yl)pyridazine-3-carboxamide 20

2-20 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-5-(4-((4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1- yl)pyrazine-2-carboxamide 21

2-21 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1- yl)benzamide 22

2-22 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1- yl)-3-fluorobenzamide 23

2-23 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-(2-(4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperazin-1-yl)-3- fluorobenzamidee 24

2-24 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-(2-(4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)-3- fluorobenzamide 25

2-25 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-(2-(4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1- yl)nicotinamide 26

2-26 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4-(2-(4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)pyrimidine- 5-carboxamide 27

2-27 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-(2-(4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1- yl)pyridazine-3-carboxamide 28

2-28 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-(2-(4- (2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1- yl)-5-fluoronicotinamide 29

2-29 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4- (2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)nicotinamide 30

2-30 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4-((4- (2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)pyrimidin-5-carboxamide 31

2-31 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4- (2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)pyridazine-3-carboxamide 32

2-32 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)-3-fluorobenzamide 33

2-33 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-((S)-2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)nicotinamide 34

2-34 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-((S)-2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)pyridazine-3-carboxamide 35

2-35 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)pyridazine-3-carboxamide 36

2-36 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6- (4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluroo-1,3-dioxoisoindolin-5- yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinamide 37

2-37 N-((1r,3S)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (((2S)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)nicotinamide 38

2-38 N-((1r,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (((2R)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2-methylpiperazin-1- yl)methyl)piperidin-1-yl)nicotinamide 39

2-39 N-((1r,3S)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)- 4-(4-(((2S)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)benzamide 40

2-40 N-((1r,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4- (4-(((2R)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)benzamide 41

2-41 N-((1r,3S)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((2S)-2-((dimethylamino)methyl)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3- dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide 42

2-42 N-((1r,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-(((2R)- 2-((dimethylamino)methyl)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide 43

2-43 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4- tetramethylcyclobutyl)-4-(4-(2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3- dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)benzamide 44

2-44 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)pyridazine-3-carboxamide 45

2-45 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-(((2- (dimethylamino)ethyl)((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5- yl)oxy)cyclobutyl)amino)methyl)piperidin-1-yl)-3-fluorobenzamide 46

2-46 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)-5-fluoronicotinamide 47

2-47 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)benzamide 48

2-48 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-(2,6- dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1- yl)-3-fluorobenzamide 49

2-49 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4- (2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)benzamide 50

2-50 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4-((4- (2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1- yl)methyl)piperidin-1-yl)pyrimidin-5-carboxamide 51

2-51 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4- (2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-3-fluorobenzamide 52

2-52 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-5-fluoronicotinamide 53

2-53 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4- (2-((S)-2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-3-flurobenzamide 54

2-54 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((((1r,3r)-3-((2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(ethyl)amino) methyl)piperidin-1-yl)benzamide

Pharmaceutical Compositions

Pharmaceutical compositions of the present disclosure comprise at least one compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing formulated together with a pharmaceutically acceptable carrier. These formulations include those suitable for oral, rectal, topical, buccal and parenteral (e.g., subcutaneous, intramuscular, intradermal, or intravenous) administration. The most suitable form of administration in any given case will depend on the degree and severity of the condition being treated and on the nature of the particular compound being used.

Formulations suitable for oral administration may be presented in discrete units, such as capsules, cachets, lozenges, or tablets, each containing a predetermined amount of a compound of the present disclosure as powder or granules; as a solution or a suspension in an aqueous or non-aqueous liquid; or as an oil-in-water or water-in-oil emulsion. As indicated, such formulations may be prepared by any suitable method of pharmacy which includes the step of bringing into association at least one compound of the present disclosure as the active compound and a carrier or excipient (which may constitute one or more accessory ingredients). The carrier must be acceptable in the sense of being compatible with the other ingredients of the formulation and must not be deleterious to the recipient. The carrier may be a solid or a liquid, or both, and may be formulated with at least one compound described herein as the active compound in a unit-dose formulation, for example, a tablet, which may contain from about 0.05% to about 95% by weight of the at least one active compound. Other pharmacologically active substances may also be present including other compounds. The formulations of the present disclosure may be prepared by any of the well-known techniques of pharmacy consisting essentially of admixing the components.

For solid compositions, conventional nontoxic solid carriers include, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharin, talc, cellulose, glucose, sucrose, magnesium carbonate, and the like. Liquid pharmacologically administrable compositions can, for example, be prepared by, for example, dissolving or dispersing, at least one active compound of the present disclosure as described herein and optional pharmaceutical adjuvants in an excipient, such as, for example, water, saline, aqueous dextrose, glycerol, ethanol, and the like, to thereby form a solution or suspension. In general, suitable formulations may be prepared by uniformly and intimately admixing the at least one active compound of the present disclosure with a liquid or finely divided solid carrier, or both, and then, if necessary, shaping the product. For example, a tablet may be prepared by compressing or molding a powder or granules of at least one compound of the present disclosure, which may be optionally combined with one or more accessory ingredients. Compressed tablets may be prepared by compressing, in a suitable machine, at least one compound of the present disclosure in a free-flowing form, such as a powder or granules, which may be optionally mixed with a binder, lubricant, inert diluent and/or surface active/dispersing agent(s). Molded tablets may be made by molding, in a suitable machine, where the powdered form of at least one compound of the present disclosure is moistened with an inert liquid diluent.

Formulations suitable for buccal (sub-lingual) administration include lozenges comprising at least one compound of the present disclosure in a flavored base, usually sucrose and acacia or tragacanth, and pastilles comprising the at least one compound in an inert base such as gelatin and glycerin or sucrose and acacia.

Formulations of the present disclosure suitable for parenteral administration comprise sterile aqueous preparations of at least one compound of Formula (1) (e.g. Formula (1A), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, which are approximately isotonic with the blood of the intended recipient. These preparations are administered intravenously, although administration may also be affected by means of subcutaneous, intramuscular, or intradermal injection. Such preparations may conveniently be prepared by admixing at least one compound described herein with water and rendering the resulting solution sterile and isotonic with the blood. Injectable compositions according to the present disclosure may contain from about 0.1 to about 5% w/w of the active compound.

Formulations suitable for rectal administration are presented as unit-dose suppositories. These may be prepared by admixing at least one compound as described herein with one or more conventional solid carriers, for example, cocoa butter, and then shaping the resulting mixture.

Formulations suitable for topical application to the skin may take the form of an ointment, cream, lotion, paste, gel, spray, aerosol, or oil. Carriers and excipients which may be used include Vaseline, lanoline, polyethylene glycols, alcohols, and combinations of two or more thereof. The active compound (i.e., at least one compound of Formula (1) (e.g. Formula (1A), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing) is generally present at a concentration of from about 0.1% to about 15% w/w of the composition, for example, from about 0.5 to about 2%.

The amount of active compound administered may be dependent on the subject being treated, the subjects weight, the manner of administration and the judgment of the prescribing physician. For example, a dosing schedule may involve the daily or semi-daily administration of the encapsulated compound at a perceived dosage of about 1 μg to about 1000 mg. In another embodiment, intermittent administration, such as on a monthly or yearly basis, of a dose of the encapsulated compound may be employed. Encapsulation facilitates access to the site of action and allows the administration of the active ingredients simultaneously, in theory producing a synergistic effect. In accordance with standard dosing regimens, physicians will readily determine optimum dosages and will be able to readily modify administration to achieve such dosages.

A therapeutically effective amount of a compound or composition disclosed herein can be measured by the therapeutic effectiveness of the compound. The dosages, however, may be varied depending upon the requirements of the patient, the severity of the condition being treated, and the compound being used. In one embodiment, the therapeutically effective amount of a disclosed compound is sufficient to establish a maximal plasma concentration. Preliminary doses as, for example, determined according to animal tests, and the scaling of dosages for human administration is performed according to art-accepted practices.

Toxicity and therapeutic efficacy can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD₅₀ (the dose lethal to 50% of the population) and the ED₅₀ (the dose therapeutically effective in 50% of the population). The dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD₅₀/ED₅₀. Compositions that exhibit large therapeutic indices are preferable.

Data obtained from the cell culture assays or animal studies can be used in formulating a range of dosage for use in humans. Therapeutically effective dosages achieved in one animal model may be converted for use in another animal, including humans, using conversion factors known in the art (see, e.g., Freireich et al., Cancer Chemother. Reports 50(4):219-244 (1966) and the following table (Table 3) for Equivalent Surface Area Dosage Factors).

TABLE 3 Equivalent Surface Area Dosage Factors. To: Mouse Rat Monkey Dog Human From: (20 g) (150 g) (3.5 kg) (8 kg) (60 kg) Mouse 1 1/2 1/4 1/6  1/12 Rat 2 1 1/2 1/4 1/7 Monkey 4 2 1 3/5 1/3 Dog 6 4 3/5 1 1/2 Human 12 7 3 2 1

The dosage of such compounds lies preferably within a range of circulating concentrations that include the ED₅₀ with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized. Generally, a therapeutically effective amount may vary with the subject's age, condition, and gender, as well as the severity of the medical condition in the subject. The dosage may be determined by a physician and adjusted, as necessary, to suit observed effects of the treatment.

Methods of Treatment

In some embodiments, a compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, is administered to treat cancer in a subject in need thereof. In some embodiments, the cancer is chosen from prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer. In some embodiments, the cancer is prostate cancer. In some embodiments, the cancer is head and neck cancer. In some embodiments, the cancer is skin cancer. In some embodiments, the cancer is sarcoma. In some embodiments, the cancer is renal cell carcinoma. In some embodiments, the cancer is adrenocortical carcinoma. In some embodiments, the cancer is bladder cancer. In some embodiments, the cancer is lung cancer. In some embodiments, the cancer is gastric carcinoma. In some embodiments, the cancer is esophageal carcinoma. In some embodiments, the cancer is pancreatic adenocarcinoma. In some embodiments, the cancer is colorectal cancer. In some embodiments, the cancer is connective tissue cancer. In some embodiments, the cancer is glioblastoma multiforme. In some embodiments, the cancer is cervical cancer. In some embodiments, the cancer is uterine cancer. In some embodiments, the cancer is ovarian cancer. In some embodiments, the cancer is breast cancer.

In some embodiments, the cancer is androgen receptor positive.

In some embodiments, a compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, is administered as a pharmaceutical composition.

In some embodiments, the subject has been previously treated with an anti-cancer agent. In some embodiments, the anti-cancer agent is enzalutamide, apalutamide, bicalutamide, darolutamide, flutamide, abiratarone, or a combination of any of the foregoing. In some embodiments, the anti-cancer agent is enzalutamide.

In some embodiments, provided herein is a use of a compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, for treating cancer. In some embodiments, the cancer is selected from prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer. In some embodiments, the cancer is prostate cancer. In some embodiments, the cancer is head and neck cancer. In some embodiments, the cancer is skin cancer. In some embodiments, the cancer is sarcoma. In some embodiments, the cancer is renal cell carcinoma. In some embodiments, the cancer is adrenocortical carcinoma. In some embodiments, the cancer is bladder cancer. In some embodiments, the cancer is lung cancer. In some embodiments, the cancer is gastric carcinoma. In some embodiments, the cancer is esophageal carcinoma. In some embodiments, the cancer is pancreatic adenocarcinoma. In some embodiments, the cancer is colorectal cancer. In some embodiments, the cancer is connective tissue cancer. In some embodiments, the cancer is glioblastoma multiforme. In some embodiments, the cancer is cervical cancer. In some embodiments, the cancer is uterine cancer. In some embodiments, the cancer is ovarian cancer. In some embodiments, the cancer is breast cancer. In some embodiments, the cancer is androgen receptor positive.

In some embodiments, provided herein is a use of a compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, in the preparation of a medicament. In some embodiments, the medicament is for the treatment of cancer. In some embodiments, the cancer is selected from prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer. In some embodiments, the cancer is prostate cancer. In some embodiments, the cancer is head and neck cancer. In some embodiments, the cancer is skin cancer. In some embodiments, the cancer is sarcoma. In some embodiments, the cancer is renal cell carcinoma. In some embodiments, the cancer is adrenocortical carcinoma. In some embodiments, the cancer is bladder cancer. In some embodiments, the cancer is lung cancer. In some embodiments, the cancer is gastric carcinoma. In some embodiments, the cancer is esophageal carcinoma. In some embodiments, the cancer is pancreatic adenocarcinoma. In some embodiments, the cancer is colorectal cancer. In some embodiments, the cancer is connective tissue cancer. In some embodiments, the cancer is glioblastoma multiforme. In some embodiments, the cancer is cervical cancer. In some embodiments, the cancer is uterine cancer. In some embodiments, the cancer is ovarian cancer. In some embodiments, the cancer is breast cancer. In some embodiments, the cancer is androgen receptor positive.

In some embodiments, provided herein is a method of inhibiting cell growth comprising contacting a cell with a compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing. In some embodiments, the cell is a cancer cell. In some embodiments, the cancer cell is a prostate cancer cell. In some embodiments, the cell is androgen receptor positive.

In one embodiment, a compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, pharmaceutically acceptable salt or hydrate thereof, may be administered in combination with another therapeutic agent. The other therapeutic agent can provide additive or synergistic value relative to the administration of a compound of the present disclosure alone. The therapeutic agent can be selected from, for example, hormones and hormonal analogues; signal transduction pathway inhibitors; topoisomerase I inhibitors; topoisomerase II inhibitors; antimetabolite neoplastic agents; antibiotic neoplastic agents; alkylating agents; anti-microtubule agents; platinum coordination complexes; aromatase inhibitors; and anti-mitotic agents.

In some embodiments, the therapeutic agent may be a hormone or hormonal analogue. In some embodiments, the therapeutic agent may be a signal transduction pathway inhibitor. In some embodiments, the therapeutic agent may be a topoisomerase I inhibitor. In some embodiments, the therapeutic agent may be a topoisomerase II inhibitor. In some embodiments, the therapeutic agent may be an antimetabolite neoplastic agent. In some embodiments, the therapeutic agent may be an antibiotic neoplastic agent. In some embodiments, the therapeutic agent may be an alkylating agent. In some embodiments, the therapeutic agent may be an anti-microtubule agent. In some embodiments, the therapeutic agent may be a platinum coordination complex. In some embodiments, the therapeutic agent may be an aromatase inhibitor. In some embodiments, the therapeutic agent may be an anti-mitotic agent.

In some embodiments, the aromatase inhibitor may be selected from anastrazole, letrozole, vorozole, fadrozole, exemestane, and formestane. In some embodiments, the aromatase inhibitor is anastrazole. In some embodiments, the aromatase inhibitor may be letrozole. In some embodiments, the aromatase inhibitor may be vorozole. In some embodiments, the aromatase inhibitor may be fadrozole. In some embodiments, the aromatase inhibitor may be exemestane. In some embodiments, the aromatase inhibitor may be formestane.

In some embodiments, the anti-mitotic agent may be selected from paclitaxel, docetaxel, and Abraxane. In some embodiments, the anti-mitotic agent may be paclitaxel. In some embodiments, the anti-mitotic agent may be docetaxel. In some embodiments, the anti-mitotic agent may be Abraxane.

In some embodiments, a compound of Formula (1) (e.g. Formula (1A)), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, may be administered in combination with a hormone or hormonal analog. In some embodiments, a compound of Formula (1), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, may be administered in combination with a signal transduction pathway inhibitor. In some embodiments, a compound of Formula (1), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, may be administered in combination with an antimetabolite neoplastic agent. In some embodiments, a compound of Formula (1), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, may be administered in combination with a topoisomerase I inhibitor. In some embodiments, a compound of Formula (1), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, may be administered in combination with a topoisomerase II inhibitor. In some embodiments, a compound of Formula (1), or a tautomer, stereoisomer, or pharmaceutically acceptable salt thereof, or a deuterated derivative of any of the foregoing, may be administered in combination with an aromatase inhibitor.

EXAMPLES

The examples and preparations provided below further illustrate and exemplify the compounds as disclosed herein and methods of preparing such compounds. It is to be understood that the scope of the present disclosure is not limited in any way by the scope of the following examples and preparations.

The chemical entities described herein can be synthesized according to one or more illustrative schemes herein and/or techniques well known in the art. Unless specified to the contrary, the reactions described herein take place at atmospheric pressure, generally within a temperature range from about −10° C. to about 200° C. Further, except as otherwise specified, reaction times and conditions are intended to be approximate, e.g., taking place at about atmospheric pressure within a temperature range of about −10° C. to about 200° C. over a period that can be, for example, about 1 to about 24 hours; reactions left to run overnight in some embodiments can average a period of about 16 hours.

Isolation and purification of the chemical entities and intermediates described herein can be affected, if desired, by any suitable separation or purification procedure such as, for example, filtration, extraction, crystallization, column chromatography, thin-layer chromatography or thick-layer chromatography, or a combination of these procedures. See, e.g., Carey et al. Advanced Organic Chemistry, 3^(rd) Ed., 1990 New York: Plenum Press; Mundy et al., Name Reaction and Reagents in Organic Synthesis, 2^(nd) Ed., 2005 Hoboken, N.J.: J. Wiley & Sons. Specific illustrations of suitable separation and isolation procedures are given by reference to the examples hereinbelow. However, other equivalent separation or isolation procedures can also be used.

In all of the methods, it is well understood that protecting groups for sensitive or reactive groups may be employed where necessary, in accordance with general principles of chemistry. Protecting groups are manipulated according to standard methods of organic synthesis (T. W. Greene and P. G. M. Wuts (1999) Protective Groups in Organic Synthesis, 3^(rd) Ed., John Wiley & Sons). These groups may be removed at a convenient stage of the compound synthesis using methods that are readily apparent to those skilled in the art.

When desired, the (R)- and (S)-isomers of the nonlimiting exemplary compounds, if present, can be resolved by methods known to those skilled in the art, for example, by formation of diastereoisomeric salts or complexes which can be separated, e.g., by crystallization; via formation of diastereoisomeric derivatives which can be separated, e.g., by crystallization, gas-liquid or liquid chromatography; selective reaction of one enantiomer with an enantiomer-specific reagent, e.g., enzymatic oxidation or reduction, followed by separation of the modified and unmodified enantiomers; or gas-liquid or liquid chromatography in a chiral environment, e.g., on a chiral support, such as silica with a bound chiral ligand or in the presence of a chiral solvent. Alternatively, a specific enantiomer can be synthesized by asymmetric synthesis using optically active reagents, substrates, catalysts or solvents, or by converting one enantiomer to the other by asymmetric transformation.

The compounds described herein can be optionally contacted with a pharmaceutically acceptable acid to form the corresponding acid addition salts. Also, the compounds described herein can be optionally contacted with a pharmaceutically acceptable base to form the corresponding basic addition salts.

In some embodiments, disclosed compounds can generally be synthesized by an appropriate combination of generally well-known synthetic methods. Techniques useful in synthesizing these chemical entities are both readily apparent and accessible to those of skill in the relevant art, based on the instant disclosure. Many of the optionally substituted starting compounds and other reactants are commercially available, e.g., from Millipore Sigma or can be readily prepared by those skilled in the art using commonly employed synthetic methodology.

The discussion below is offered to illustrate certain of the diverse methods available for use in making the disclosed compounds and is not intended to limit the scope of reactions or reaction sequences that can be used in preparing the compounds provided herein. The skilled artisan will understand that standard atom valencies apply to all compounds disclosed herein in genus or named compound for unless otherwise specified.

All final compounds of the examples described herein were checked for purity by HPLC on a Shimadzu LC-2010A and compounds were detected at the wavelength of 214 nM and 254 nM. Purities for all final compounds were over 95% based on HPLC peaks (214 nM and 254 nM wavelength). Liquid chromatography condition: Column, XBRIDGE C18, 3.6 micron, 2.1×50 mm: Mobile phase, water (0.05% TFA) and acetonitrile (0.05% TFA), linear gradient from 10% acetonitrile to 100% acetonitrile over 7 min; Oven temperature 45° C.; Flow rate, 0.8 mL/mL. H-NMR was obtained on Bruker 400 MHz NMR spectrometer.

List of Abbreviations

ACN: acetonitrile

AcOH: acetic acid

BSA: benzenesulfonic acid

DCM: dichloromethane

DEAD: N,N-diethyl azodicarboxylate

DIEA: diisopropylethylamine

DMF: N,N-dimethylformamide

DMAP: 4-dimethylaminopyridine

DMSO: dimethylsulfoxide

EA: ethylacetate

HATU; O-(7-Azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate

HPLC: high performance liquid chromatography

HRMS: high resolution mass spectrometry

IBX: 2-iodoxybenzoic acid

LC/MS: liquid chromatography mass spectrometry

MW: microwave

NMI: N-methylimidazole

NMP: N-methyl-2-pyrrolidone

NMR: nuclear magnetic resonance

PTSA: p-toluenesulfonic acid

TCFH: N,N,N′,N′-tetramethylchloroformamidinium hexafluorophosphate

TEA: triethylamine

THF: tetrahydrofuran

TLC: thin layer chromatography

Prep-TLC; preparative thin layer chromatography

TFA: trifluoroacetic acid

General Synthetic Schemes

Compounds of Formula (1) (e.g. Formula (1A); see compounds in Table 2) can be prepared according to the following schemes. The following schemes represent the general methods used in preparing these compounds. However, the synthesis of these compounds is not limited to these representative methods, as they can also be prepared by various other methods those skilled in the art of synthetic chemistry, for example, in a stepwise or modular fashion.

Compound 2-2 can be synthesized according to the method described in Scheme 1.

Compounds 2-3, 2-4, 2-5 can be prepared according to the similar method as described in Scheme 2.

Compounds 2-14, 2-15, 2-16, and 17 can be synthesized with similar method as described in Scheme 4.

Compounds 2-19, 2-20, and 2-46 can be synthesized through the same method.

The same method can be used to synthesize 2-21.

Compounds 2-23, 2-24, 2-25, 2-26, 2-27, and 2-28 can be prepared using the similar synthetic route.

The following compounds can be synthesized according to similar synthetic method as described in Scheme 6: 2-29, 2-30, 2-31, 2-33, 2-34, and 2-49.

The following compounds can be synthesized according to similar synthetic method as described in Scheme 9: 2-8, 2-9, 2-10, 2-12 and 2-44.

Compounds 2-35, 2-47, 2-48 and 2-50 can be synthesized using the same method.

Compounds 2-38, 2-39 and 2-40 can be prepared using the same route described in Scheme 11.

Preparation of Intermediates Synthesis of trans-5-[3-amino-2,2,4,4-tetramethylcyclobutoxy)]quinoline-8-carbonitrile hydrochloride (Intermediate 1-1)

Step 1: Preparation of 5-fluoroquinoline-8-carbonitrile

A mixture containing 8-bromo-5-fluoroquinoline (2.00 g, 8.85 mmol, 1.00 eq), Pd(PPh₃)₄ (1.02 g, 884.7 umol, 0.10 eq) and Zn(CN)₂ (2.01 g, 17.1 mmol, 1.08 mL, 1.93 eq) was taken up into a microwave tube in DMF (20.0 mL). The sealed tube was heated at 150° C. for 0.5 h under microwave condition. TLC (petroleum ether/ethyl acetate=3/1, R_(f) (starting material)=0.50, R_(f) (product)=0.32) showed the starting material was consumed completely. Four reactions were repeated in parallel and the resulting reactions were combined for workup. The mixture was poured into water (300.0 mL), extracted with EtOAc (80.0 mL×2). The combined organic layers were washed with brine (150.0 mL), dried over Na₂SO₄, filtered and concentrated under reduce pressure to give a residue. The crude product was purified by column chromatography on silica gel eluted with petroleum ether/ethyl acetate (50/1 to 1/1) to provide the title compound (3.20 g, 52.1% yield) as a white solid. ¹H NMR (400 MHz, CDCl₃) δ 9.18 (dd, J=4.44, 1.65 Hz, 1H), 8.52 (dd, J=8.40, 1.65 Hz, 1H), 8.14 (dd, J=8.40, 5.51 Hz, 1H), 7.64 (dd, J=8.44, 4.30 Hz, 1H), 7.32 (t, J=8.40 Hz, 1H).

Step 2: Preparation of tert-butyl trans-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)carbamate

To a solution of 5-fluoroquinoline-8-carbonitrile (1.60 g, 9.29 mmol, 1.00 eq) and trans-tert-butyl-3-hydroxy-2,2,4,4-tetramethylcyclobutyl)carbamate (2.26 g, 9.29 mmol, 1.00 eq) in ACN (30.0 mL) was added Cs₂CO₃ (6.06 g, 18.5 mmol, 2.00 eq) at 15° C., then the mixture was stirred at 100° C. for 4 h. TLC (petroleum ether/ethyl acetate=2/1, R_(f) (starting material)=0.51, R_(f) (product)=0.39) showed the starting material was consumed completely. The mixture was filtered out and the cake was washed with EtOAc (30.0 mL), the combined organic layers were concentrated in vacuum. The crude product was purified by column chromatography on silica gel eluted with petroleum ether/ethyl acetate (50/1 to 1/1) to provide the title compound (1.70 g, 46.3% yield) was obtained as white solid.

Step 3: Preparation of trans-5-[3-amino-2,2,4,4-tetramethylcyclobutoxy)]quinoline-8-carbonitrile hydrochloride (Intermediate 1-1)

To a solution of tert-butyl trans-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)carbamate (1.70 g, 4.30 mmol, 1.00 eq) in DCM (10.0 mL) was added HCl (g)/EtOAc (4.00 M, 30.0 mL, 27.9 eq) at 0° C. and the mixture was stirred for 0.5 h. TLC (petroleum ether/ethyl acetate=2/1, R_(f) (starting material)=0.53, R_(f) (product)=0) showed the starting material was consumed completely. The mixture was filtered out and the solid was washed with DCM (10.0 mL), dried under vacuum to provide the title compound (1.33 g, 92.4% yield, 99.1% purity) as a yellow solid of hydrochloride. LC/MS 296.3 (M+H)+; ¹H NMR: (400 MHz, MeOD) δ 9.19-9.30 (m, 2H), 8.42 (d, J=8.40 Hz, 1H), 8.04 (dd, J=8.84, 5.2 Hz, 1H), 7.21 (d, J=8.44 Hz, 1H), 4.70 (s, 1H), 3.40 (s, 1H), 1.48 (s, 6H), 1.34 (s, 6H).

Synthesis of 2-(2,6-dioxopiperidin-3-yl)-5-(piperazin-1-yl)isoindoline-1,3-dione (Intermediate 1-2)

Intermediate 1-2 was prepared according to the above scheme as a hydrochloride salt using a similar method described in the literature. LC/MS 343.1 [M+H]⁺; ¹H-NMR (400 MHz, CD₃OD) δ ppm 7.76 (d, J=8.36 Hz, 1H), 7.47 (s, 1H), 7.35 (dd, J=8.36, 1.54 Hz, 1H), 5.09 (br dd, J=12.8, 5.40 Hz, 1H), 3.67-3.74 (m, 4H), 3.37-3.42 (m, 4H), 2.63-2.94 (m, 3H), 2.07-2.17 (m, 1H).

Synthesis of (S)-3-(6-fluoro-1-oxo-5-(piperazin-1-yl)isoindolin-2-yl)piperidine-2,6-dione (Intermediate 1-3)

Step 1: Preparation of methyl 2-bromo-4,5-difluorobenzoate

Thionyl chloride (130 g, 1.09 mol) was added slowly to a mixture of 2-bromo-4,5-difluorobenzoic acid (200 g, 0.84 mol) in MeOH (600 mL) at 10° C., the mixture was stirred at 80° C. for 3 h. TLC showed the reaction was completed. The mixture was cooled to room temperature, concentrated, then partitioned between ethyl acetate and water. The organic layer was washed with saturated Na₂CO₃ and brine twice, dried over Na₂SO₄ and concentrated to afford a crude methyl 2-bromo-4,5-difluorobenzoate (210 g, yield: 100%) which was used for the next step without further purification.

Step 2: Preparation of tert-butyl 4-(5-bromo-2-fluoro-4-(methoxycarbonyl)phenyl) piperazine-1-carboxylate

A mixture of methyl 2-bromo-4,5-difluorobenzoate (210 g, 0.84 mol), tert-butyl piperazine-1-carboxylate (234 g, 1.25 mol) and K₂CO₃ (173 g, 1.25 mol) in N,N-dimethylacetamide (600 mL) was stirred at 80° C. for 16 h. TLC showed the reaction was completed. The mixture was added to water (2 L) and stirred for 10 min followed by the addition of ethyl acetate. The mixture was partitioned between ethyl acetate and water. The organic layer was washed with water, brine, dried over Na₂SO₄ and concentrated to afford tert-butyl 4-(5-bromo-2-fluoro-4-(methoxycarbonyl)phenyl)piperazine-1-carboxylate (315.8 g, yield: 90%).

Step 3: Preparation of tert-butyl 4-(5-cyano-2-fluoro-4-(methoxycarbonyl)phenyl) piperazine-1-carboxylate

A mixture of tert-butyl 4-(5-bromo-2-fluoro-4-(methoxycarbonyl)phenyl)piperazine-1-carboxylate (306 g, 0.73 mol) and CuCN (98 g, 1.09 mol) in DMF (1.2 L) was stirred at 100° C. for 16 h. TLC showed the reaction was completed. The mixture was cooled to room temperature. Ethyl acetate (2 L) and ammonium hydroxide (2 L) were added and the mixture was stirred for 30 min. The mixture was filtered. The organic layer was washed with water, dried over Na₂SO₄ and concentrated to afford a crude product (254 g). This crude product was taken into petroleum ether (1 L) at reflux. The mixture was filtered and dried in oven at 50° C. to afford tert-butyl 4-(5-cyano-2-fluoro-4-(methoxycarbonyl)phenyl)piperazine-1-carboxylate (215 g, yield: 81%).

Step 4: Preparation of tert-butyl 4-(2-fluoro-5-formyl-4-(methoxycarbonyl)phenyl) piperazine-1-carboxylate

To a solution of pyridine (391 g, 4.95 mol), water (200 mL), acetic acid (264 g, 4.4 mol) was added tert-butyl 4-(5-cyano-2-fluoro-4-(methoxycarbonyl)phenyl)piperazine-1-carboxylate (200 g, 0.55 mol) and Raney-nickel (85% in water, 100 g) at room temperature. The resulting mixture was heated to 60° C. Sodium hypophosphite (292 g in 500 mL water) was added dropwise into the mixture. The mixture was stirred for 16 h at 60° C. TLC showed the reaction not completed. The mixture was further stirred for 10 h. The mixture was cooled to room temperature. Ethyl acetate and water were added. The mixture was filtered. The organic layer was washed with water, 1N HCl and brine, dried over Na₂SO₄ and concentrated under reduced pressure to afford a crude product (208 g, crude) which was further purified by silica-gel pad to provide 4-(2-fluoro-5-formyl-4-(methoxycarbonyl)phenyl)piperazine-1-carboxylate (86.5 g, yield: 43%).

Step 5: Preparation of tert-butyl (S)-4-(2-(1-amino-5-(tert-butoxy)-1,5-dioxopentan-2-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazine-1-carboxylate

To a solution of tert-butyl 4-(2-fluoro-5-formyl-4-(methoxycarbonyl)phenyl)piperazine-1-carboxylate (81.5 g, 0.22 mol) in methanol (500 mL) was added tert-butyl (S)-4,5-diamino-5-oxopentanoate (54 g, 0.27 mol) at room temperature. Acetic acid (19.8 g, 0.33 mol) was added at 0° C. followed by the addition of sodium cyanoborohydride (27.6 g, 0.44 mol) slowly. The mixture was stirred at room temperature for 16 hours. TLC showed the reaction was completed. The mixture was concentrated and partitioned between ethyl acetate and water. The organic layer was washed with saturated citric acid, brine, dried over Na₂SO₄ and concentrated under reduced pressure to afford a crude product which was further purified by silica-gel pad to give tert-butyl (S)-4-(2-(1-amino-5-(tert-butoxy)-1,5-dioxopentan-2-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazine-1-carboxylate (80 g, yield: 69%).

Step 6: Preparation of (S)-3-(6-fluoro-1-oxo-5-(piperazin-1-yl)isoindolin-2-yl)piperidine-2,6-dione benzenesulfonic acid (Intermediate 1-3)

To a solution of (S)-4-(2-(1-amino-5-(tert-butoxy)-1,5-dioxopentan-2-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazine-1-carboxylate (67 g, 0.13 mol) in acetonitrile (670 mL) was added benzenesulfonic acid (43 g, 0.26 mol). The mixture was stirred at 80° C. for 16 h. LCMS showed the reaction was complete. The mixture was cooled to room temperature. The mixture was filtered and dried to afford (S)-3-(6-fluoro-1-oxo-5-(piperazin-1-yl)isoindolin-2-yl)piperidine-2,6-dione benzenesulfonic acid (56 g, 86%) as off-white solid. ¹H NMR (400 MHz, DMSO-d6) δ 1.94-1.99 (m, 1H), 2.35-2.43 (m, 1H), 2.58-2.62 (m, 1H), 2.88-2.91 (m, 1H), 3.30 (br s, 8H), 4.38 (d, J=17.2 Hz, 1H), 4.26 (d, J=17.2 Hz, 1H), 5.08 (dd, J=13.2, 5.2 Hz, 1H), 7.29-7.35 (m, 4H), 7.49 (d, J=8.7 Hz, 1H), 7.60 (m, 2H), 8.72 (br s, 2H), 10.99 (s, 1H). LCMS m/z 347.3 [M+1]⁺.

Synthesis of (S)-3-(1-oxo-5-(piperazin-1-yl)isoindolin-2-yl)piperidine-2,6-dione (Intermediate 1-4)

To a solution of (S)-tert-butyl 4-(2-(1-amino-5-tert-butoxy-1,5-dioxopentan-2-yl)-1-oxoisoindolin-5-yl)piperazine-1-carboxylate (5.8 g, 12 mol, prepared using the same method as described for Intermediate 1-3) in acetonitrile (90 mL) was added benzenesulfonic acid (3.64 g, 23 mol). The mixture was stirred at 85° C. for 12 h. LC/MS showed the reaction was complete. The mixture was concentrated in vacuum. The residue was triturated with ethyl acetate to afford (S)-3-(1-oxo-5-(piperazin-1-yl)isoindolin-2-yl)piperidine-2,6-dione benzenesulfonate (5.2 g, 93%) as off-white solid. LC/MS 329.1 [M+1]⁺; ¹H NMR (400 MHz, DMSO-d6) δ 1.95-1.99 (m, 1H), 2.36-2.41 (m, 1H), 2.58-2.62 (d, 1H), 2.88-2.91 (m, 1H), 3.26 (s, 4H), 3.49-3.52 (m, 4H), 4.21-4.38 (dd, 2H), 5.05-5.10 (dd, 1H), 7.12-7.16 (m, 2H), 7.30-7.358 (m, 3H), 7.58-7.62 (m, 3H), 8.72 (s, 2H), 11.0 (s, 1H).

Synthesis of 2-(2,6-dioxopiperidin-3-yl)-5-fluoro-6-(piperazin-1-yl)isoindoline-1,3-dione (Intermediate 1-5)

Intermediate 1-5 was prepared according to the above scheme as a hydrochloride salt. LC/MS 361.1 [M+1]⁺; ¹H NMR (400 MHz, DMSO-d6) δ 11.1 (s, 1H), 9.49 (br s, 2H), 7.79 (d, J=11.2 Hz, 1H), 7.57 (br d, J=7.32 Hz, 1H), 5.12 (br dd, J=12.4, 5.32 Hz, 1H), 3.50 (br s, 4H), 3.24 (br s, 4H), 2.80-2.95 (m, 1H), 2.52-2.69 (m, 2H), 1.97-2.10 (m, 1H)

Preparation of Example Compounds

All final compounds of examples described in this section and in Table 2 were checked for purity by HPLC and compounds were detected at the wavelength of 214 nM and 254 nM. Purities for all final compounds were over 95% based on HPLC peak analysis (214 nM and 254 nM wavelength). H-NMR was obtained on Bruker NMR spectrometer (400 MHz). LC/MS was performed on Agilent 6125 under the following condition: column, Waters CORTECS C18, 2.7 um, 4.6×30 mm; mobile phase, ACN (0.05% TFA) and water (0.05 TFA); gradient: 5% ACN to 95% ACN in 1.0 min, hold 1.0 min, total 2.5 min; flow rate 1.8 mL/min; column temperature 45° C. Analytical HPLC was performed on SHIMADZU LC-2010A under the following conditions: column, XBRIDGE 3.5 um, 2.1×50 mm; mobile phase, water (0.05% TFA) and ACN (0.05% TFA); gradient, ACN from 10% to 100% over 7 minutes, hold 1 min; column oven temperature, 45° C.; flow rate, 0.8 mL/min.

Example 1: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinamide (2-9)

Step 1: Preparation of 2-(2,6-dioxopiperidin-3-yl)-5-hydroxyisoindoline-1,3-dione

To a solution of 3-aminopiperidine-2,6-dione hydrochloride (8.7 g, 52.5 mmol) in acetic acid (350 mL) stirred under nitrogen at room temperature was added 5-hydroxyisobenzofuran-1,3-dione (8.7 g, 52.5 mmol) and Et₃N (11.7 g, 115.5 mmol). The reaction mixture was then stirred at 120° C. for 3 hours. The reaction mixture was cooled to room temperature and filtered to give a crude product. The crude product was stirred in water (50 mL) for 1 hour, filtered, washed with water (20 mL) and dried to give the desired product (11.4 g, 5.4 mmol, 79% yield) as yellow solid. LC/MS: 274.8 [M+1]⁺

Step 2: Preparation of tert-butyl ((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)carbamate

To a solution of 2-(2,6-dioxopiperidin-3-yl)-5-hydroxyisoindoline-1,3-dione (5.7 g, 20.8 mmol), tert-butyl (1,3-cis)-N-(3-hydroxycyclobutyl)carbamate (3.9 g, 20.8 mmol) and PPha (6.5 g, 24.9 mmol) in THE (50 mL) stirred under hydrogen at 60° C. was added DEAD (4.3 g, 24.9 mmol). The reaction mixture was stirred at 60° C. for 3 hours. The reaction mixture was filtered and evaporated in vacuo. The residue was purified by silica gel column chromatography (DCM:MeOH=10:1) to give the crude product (11 g, 17.4 mmol, 70% purity, 83% yield) as a yellow solid.

Step 3: Preparation of 5-((1,3-trans)-3-aminocyclobutoxy)-2-(2,6-dioxopiperidin-3-yl)isoindoline-1,3-dione

A solution of tert-butyl ((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)carbamate (11 g, 17.4 mmol, 70% purity) in DCM (30 mL) was added TFA (10 mL). The reaction mixture was stirred for 3 hours at room temperature and evaporated in vacuo to give the crude product. The crude product was worked up and purified by silica gel column chromatography (DCM:MeOH=10:1) to give the desired product (1.4 g, 4 mmol, 23% yield) as a red solid. LC/MS: 343.9 [M+1]⁺.

Step 4: Preparation of tert-butyl 6-(4-(hydroxymethyl)piperidin-1-yl)nicotinate

A mixture of tert-butyl 6-chloronicotinate (500 mg, 2.35 mmol), piperidin-4-ylmethanol (297 mg, 2.58 mmol) and DIEA (606 mg, 4.70 mmol) in DMSO (10 mL) was stirred at 100° C. overnight. TLC showed the reaction completed. The mixture was partitioned between EA and H₂O. The organic phase was washed with brine, dried over magnesium sulfate and evaporated to dryness. The crude product was purified by silica gel chromatography (10-50% EtOAc in hexane as eluent) to afford the desired compound (400 mg, 58.3%). LC/MS: 293.2 [M+H]⁺.

Step 5: Preparation of tert-butyl 6-(4-formylpiperidin-1-yl)nicotinate

A mixture of tert-butyl 6-(4-(hydroxymethyl)piperidin-1-yl)nicotinate (574 mg, 1.97 mmol) and IBX (658 mg, 2.35 mmol) in DMSO (10 mL) was stirred at 50° C. overnight. TLC showed the reaction completed. The mixture was partitioned between EA and H₂O. The organic phase was washed with brine, dried over magnesium sulfate and evaporated to dryness. The crude product was purified by silica gel chromatography with 10-50% EtOAc in hexane as eluent to afford the desired compound (400 mg, 70%). LC/MS: 291.0 [M+H]⁺.

Step 6: Preparation of tert-butyl 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)amino)methyl)piperidin-1-yl)nicotinate

To a solution of tert-butyl 6-(4-formylpiperidin-1-yl)nicotinate (50 mg, 0.17 mmol), 5-((1,3-trans)-3-aminocyclobutoxy)-2-(2,6-dioxopiperidin-3-yl)isoindoline-1,3-dione (58.36 mg, 0.17 mmol) and triethylamine (86.01 mg, 0.85 mmol) in DCM (10 mL) stirred under nitrogen at room temperature was added MgSO₄ (204 mg, 1.7 mmol). The reaction mixture was stirred at room temperature for 2 hours. Then sodium triacetoxyborohydride (90.07 mg, 0.43 mmol) was added portion-wise at 0° C., and the reaction mixture was further stirred at room temperature for 2 hours. The reaction mixture was filtered, and the filtrate was evaporated in vacuo to give the crude product. The crude product was purified by Prep-TLC eluted with CH₂Cl₂ and MeOH (10/1) to obtain the desired product (40 mg, 0.06 mmol, 35.3% yield) as yellow solid. LC/MS: 617.6[M+1]⁺.

Step 7: Preparation of tert-butyl 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinate

A solution containing tert-butyl 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)amino)methyl)piperidin-1-yl)nicotinate (40 mg, 0.06 mmol) and (HCHO)_(n) (2 mL) in HCOOH (4 mL) was stirred at room temperature for 3 hours. Then NaBH₄ (226.99 mg, 6 mmol) was added at 0° C. portion-wise. The reaction was stirred at room temperature for 3 hours. The reaction mixture was evaporated in vacuo to give the crude product. The residue was dissolved in DCM (150 mL), washed with water (20 mL) and evaporated in vacuo to give a crude product. The crude product was purified by Prep-TLC eluted with CH₂Cl₂ and MeOH (10:1) to provide the desired product (30 mg, 0.047 mmol, 79.2% yield) as a yellow solid. LC/MS: 631.6 [M+1]⁺.

Step 8: Preparation of 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinic acid

A solution of tert-butyl 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinate (30 mg, 0.05 mmol) in DCM/TFA (5 mL, DCM/TFA=2:1) was stirred at room temperature for 1 hour. The reaction mixture was evaporated in vacuo to give the desired product (25 mg, 0.04 mmol, 91.4% yield) as a yellow solid. LC/MS: 575.6[M+1]⁺.

Step 9: Preparation of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinamide (2-9)

To a solution of 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinic acid (20 mg, 0.03 mmol) and HATU (19.8 mg, 0.05 mmol) in DMF (5 mL) stirred under nitrogen at room temperature was added and N,N-diisopropylethylamine (49.62 mg, 0.35 mmol) and Intermediate 1-1 (11.54 mg, 0.035 mmol). The reaction mixture was stirred at room temperature for 2 hours. The reaction mixture was evaporated in vacuo to give a crude product which was purified by Prep-TLC (CH₂Cl₂/MeOH=10:1) to provide the desired product (11 mg, 0.01 mmol, 28.7% yield) as a white solid. LCMS m/z 852.6 [M+1]⁺. ¹H NMR (400 MHz, DMSO) δ 11.13 (s, 1H), 9.11 (dd, J=4.2, 1.7 Hz, 1H), 8.75 (d, J=8.5 Hz, 1H), 8.66 (s, 1H), 8.31 (d, J=8.3 Hz, 1H), 7.98 (d, J=8.7 Hz, 1H), 7.89-7.82 (m, 1H), 7.79-7.73 (m, 1H), 7.68 (d, J=9.2 Hz, 1H), 7.30 (br s, 2H), 6.97 (d, J=8.4 Hz, 1H), 6.90 (br s, 1H), 5.13 (dd, J=12.8, 5.3 Hz, 1H), 4.97 (m, 1H), 4.49 (s, 1H), 4.46 (d, J=12.4 Hz, 2H), 4.16 (d, J=8.8 Hz, 1H), 4.05 (br m, 1H), 3.25-2.80 (m, 5H), 2.78-2.54 (m, 4H), 2.30-1.97 (m, 6H), 1.75 (m, 2H), 1.35-1.12 (m, 15H). HRMS calcd for C48H52N8O7 m/z 852.3959, obsd 853.4297.

Example 2: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinamide (2-11)

Step 1: Preparation of 2-(2,6-dioxopiperidin-3-yl)-5-((1,3-trans)-3-(isopropylamino) cyclobutoxy)isoindoline-1,3-dione

A solution of 5-((1,3-trans)-3-aminocyclobutoxy)-2-(2,6-dioxopiperidin-3-yl)isoindoline-1,3-dione (600 mg, 1.75 mmol), acetone (1016 mg, 17.5 mmol), TEA (354 mg, 3.5 mmol) and MgSO₄ (4.2 g, 35 mmol) in DCM (20 mL) was stirred under nitrogen at room temperature for 30 minutes. Then sodium triacetoxyborohydride (927 mg, 4.375 mmol) was added at 0° C. portion-wise. The reaction mixture was stirred at room temperature for 2 hours. The reaction mixture was filtered, the organic layer was washed with water, extracted with DCM (50 mL) and concentrated. The residue was purified by silica gel column chromatography (DCM:MeOH=10:1) to give the desired product (200 mg, 0.51 mmol, 29.3% yield) as white solid. LC/MS: 385.7[M+1]⁺.

Step 2: Preparation of tert-butyl 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinate

To a solution of 2-(2,6-dioxopiperidin-3-yl)-5-((1,3-trans)-3-(isopropylamino) cyclobutoxy) isoindoline-1,3-dione (70 mg, 0.18 mmol) in anhydrous THF (5 ml) stirred at room temperature was added tert-butyl 6-(4-formylpiperidin-1-yl)pyridine-3-carboxylate (78 mg, 0.27 mmol), titanium tetraisopropanolate (50 mg) and AcOH (50 mg), the reaction mixture was stirred at room temperature for 24 hours, then Na(OAc)₃BH (95 mg, 0.4499 mmol) was added slowly (0.5 eq per 0.5 h). The reaction mixture was stirred at room temperature for 2 days. The reaction was diluted with 10 mL of MeOH, filtered and concentrated under vacuum to get a crude product, which was purified by flash column chromatography (DCM/MeOH=10:1) to afford tert-butyl 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinate (60 mg, 50.5%) as a yellow solid. LC/MS: 659.6 [M+H]⁺.

Step 3: Preparation of 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinic acid

A solution of tert-butyl 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinate (60 mg, 0.09 mmol) in TFA/DCM (1:3, 8 mL) was stirred at room temperature for 2 hours. The mixture was concentrated under vacuum to give a crude product (65 mg) which was used directly in the next step. LC/MS: 603.6 [M+H]⁺.

Step 4: Preparation of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinamide (2-11)

To a solution of 6-(4-((((1,3-trans)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinic acid (30 mg, 0.05 mmol) in DMF (5 mL) stirred at room temperature was added NMI (17 mg, 0.2 mmol) and TCFH (17 mg, 0.06 mmol), then Intermediate 1-1 (17 mg, 0.05 mmol) was added. The reaction mixture was stirred at room temperature for 2 hours. The mixture was quenched by the addition of 15 mL of water, extracted with EtOAc (20 mL×3). The combined organic layers were washed with brine, dried and concentrated under vacuum to give a crude product, which was purified by Prep-TLC (DCM/MeOH=10:1) to afford the desired product (15 mg, 34.1%), LC/MS: 880.6 [M+H]⁺. ¹H NMR (400 MHz, DMSO) δ=11.14 (s, 1H), 9.12 (s, 1H), 8.75 (d, J=8.0 Hz, 1H), 8.67 (s, 1H), 8.32 (d, J=8.0 Hz, 1H), 8.0 (d, J=6.8 Hz, 1H), 7.87 (d, J=6.8 Hz, 1H), 7.77 (s, 1H), 7.70 (d, J=8.0 Hz, 1H), 7.32 (s, 2H), 6.98 (d, J=8.0 Hz, 1H), 6.91 (d, J=8.0 Hz, 1H), 5.18-5.05 (m, 2H), 4.58-4.45 (m, 3H), 4.27-4.14 (m, 2H), 3.63-3.47 (m, 3H), 3.18 (br, 1H), 3.05 (br, 1H), 2.99-2.81 (m, 2H), 2.75 (br, 1H), 2.70-2.58 (m, 2H), 2.29-2.13 (m, 2H), 2.15-1.75 (m, 4H), 1.47 (br, 1H), 1.31 (s, 6H), 1.24 (s, 9H), 0.99-0.75 (m, 4H). HRMS calcd for C50H56N8O7 m/z 880.4272, obsd 881.4378.

Example 3: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinamide (2-13)

Step 1: Preparation of tert-butyl 6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinate

To a solution of tert-butyl 6-(4-formylpiperidin-1-yl)nicotinate (200 mg, 0.69 mmol), intermediate 1-2 (260 mg, 0.68 mmol), MgSO₄ (820 mg, 6.8 mmol) in dichloromethane (10 mL) was added Et₃N (140 mg, 1.36 mmol). The mixture was stirred at room temperature for 1 hour. Then the sodium triacetoxyborohydride (430 mg, 2.04 mmol) was added slowly to the mixture. The mixture was stirred at room temperature overnight. The residue was concentrated in vacuum. The crude product was purified by silica gel chromatography using 5-10% MeOH in DCM as eluent to afford the desired compound (250 mg, 59%). LC/MS: 617.3 [M+H]⁺.

Step 2: Preparation of 6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinic acid

To a solution of tert-butyl 6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinate (230 mg, 0.37 mmol) in dichloromethane (10 mL) was added TFA (2 mL). The mixture was stirred at room temperature for overnight. The residue was concentrated in vacuum. The crude product was used in next step without further purification. LC/MS: 561.1 [M+H]⁺.

Step 3: Preparation of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinamide (2-13)

A solution containing 6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinic acid (130 mg, crude), intermediate 1-1 (92 mg, 0.28 mmol), HATU (105 mg, 0.27 mmol) and DIEA (259 mg, 2.06 mmol) in DMF (7 mL) was stirred at room temperature overnight. TLC showed the reaction completed. The mixture was partitioned between EA and H₂O. The organic phase was washed with brine, dried over magnesium sulfate and evaporated to dryness. The crude product was purified by preparative TLC (MeOH:DCM=1:20) to afford the desired compound (60 mg, 31%). LC/MS: 838.3 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.10 (s, 1H), 9.12 (dd, J=4.2, 1.7 Hz, 1H), 8.75 (dd, J=8.5, 1.5 Hz, 1H), 8.65 (d, J=2.3 Hz, 1H), 8.31 (d, J=8.2 Hz, 1H), 7.96 (dd, J=9.0, 2.4 Hz, 1H), 7.77 (dd, J=8.5, 4.3 Hz, 1H), 7.68 (dd, J=12.2, 8.9 Hz, 2H), 7.36 (s, 1H), 7.27 (d, J=8.7 Hz, 1H), 6.97 (d, J=8.4 Hz, 1H), 6.87 (d, J=9.1 Hz, 1H), 5.08 (dd, J=12.9, 5.3 Hz, 1H), 4.49-4.41 (m, 3H), 4.17 (d, J=9.2 Hz, 1H), 3.46 (br s, 4H), 2.96-2.85 (m, 3H), 2.69-2.56 (m, 2H), 2.21 (d, J=7.0 Hz, 2H), 2.05-2.01 (m, 1H), 1.90-1.80 (m, 3H), 1.31 (s, 6H), 1.24 (s, 6H), 1.20-1.10 (m, 2H), 4H overlapped with DMSO-d6 and were not assigned. HRMS calcd for C47H51N9O6 m/z 837.3962, obsd 838.4035 (M+H]⁺.

Example 4: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)pyrimidine-5-carboxamide (2-18)

Step 1: Preparation of tert-butyl 2-chloropyrimidine-5-carboxylate

A mixture of 2-chloropyrimidine-5-carboxylic acid (2 g, 12.6 mmol), DMAP (154 mg, 1.26 mmol) and Boc₂O (5.5 g, 25.2 mmol) in t-BuOH (10 mL) was stirred at 50° C. overnight. TLC showed the reaction completed. The organic phase was evaporated to dryness. The crude product was purified by silica gel chromatography (10-70% EtOAc in hexane as eluent) to afford the desired compound (800 mg, 29%). LC/MS: 215.2 [M+H]⁺.

Step 2 through Step 6 were performed according to the same procedure as described in the preparation of 2-13. The desired compound 2-18 was obtained following preparative TLC (MeOH:DCM=1:20). LC/MS: 839.2 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.12 (s, 1H), 10.14 (br, 1H), 9.12 (dd, J=4.2, 1.7 Hz, 1H), 8.81 (s, 2H), 8.75 (dd, J=8.5, 1.7 Hz, 1H), 8.31 (d, J=8.3 Hz, 1H), 7.83-7.75 (m, 2H), 7.52 (s, 1H), 7.38 (d, J=8.2 Hz, 1H), 6.98 (d, J=8.4 Hz, 1H), 5.11 (dd, J=12.9, 5.2 Hz, 1H), 4.77 (d, J=13.0 Hz, 2H), 4.48 (s, 1H), 4.23 (d, J=12.0 Hz, 2H), 4.16 (d, J=8.7 Hz, 1H), 3.63 (d, J=11.1 Hz, 2H), 3.47 (t, J=12.8 Hz, 2H), 3.22-3.00 (m, 4H), 2.94-2.86 (m, 1H), 2.69-2.54 (m, 2H), 2.35-2.18 (m, 2H), 2.07-1.80 (m, 4H), 1.30 (s, 6H), 1.24 (s, 6H), 1.23-1.10 (m, 2H); NRMS calcd for C46H50N10O6 m/z 838.3915, obsd 839.4017 [M+H]⁺.

Example 5: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)pyridazine-3-carboxamide (2-19)

This compound was prepared using the same method as described for 2-13 except that tert-butyl 6-chloropyridazine-3-carboxylate was used. LC/MS: 838.7 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.10 (s, 1H), 9.12 (dd, J=4.2, 1.7 Hz, 1H), 8.77 (dd, J=8.5, 1.6 Hz, 1H), 8.31 (dd, J=8.7, 3.2 Hz, 2H), 7.84 (d, J=9.6 Hz, 1H), 7.77 (dd, J=8.5, 4.3 Hz, 1H), 7.69 (d, J=8.5 Hz, 1H), 7.41-7.34 (m, 2H), 7.28 (d, J=8.6 Hz, 1H), 7.02 (d, J=8.4 Hz, 1H), 5.08 (dd, J=12.9, 5.4 Hz, 1H), 4.62 (s, 1H), 4.52 (d, J=13.0 Hz, 2H), 4.13 (d, J=9.1 Hz, 1H), 3.46 (br s, 4H), 3.06 (t, J=12.1 Hz, 2H), 2.88 (dd, J=21.5, 9.8 Hz, 1H), 2.69-2.54 (m, 2H), 2.23 (d, J=6.9 Hz, 2H), 2.07-1.82 (m, 4H), 1.31 (s, 6H), 1.25 (s, 6H), 1.25-1.10 (m, 2H). 4H overlapped with DMSO-d6 and were not assigned. HRMS calcd for C46H50N10O6 m/z 838.3915, obsd 839.4018 [M+H]⁺.

Example 6: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)benzamide (2-21)

This compound was prepared using the same method as described for the preparation of 2-13 except that tert-butyl 4-fluorobenzoate was used. LC/MS: 837.4 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.10 (s, 1H), 9.11 (dd, J=4.2, 1.6 Hz, 1H), 8.74 (dd, J=8.5, 1.6 Hz, 1H), 8.31 (d, J=8.3 Hz, 1H), 7.80-7.73 (m, 3H), 7.69 (d, J=8.4 Hz, 1H), 7.57 (d, J=8.8 Hz, 1H), 7.35 (s, 1H), 7.27 (d, J=8.0 Hz, 1H), 7.00-6.95 (m, 3H), 5.08 (dd, J=5.2, 12.4 Hz, 1H), 4.50 (s, 1H), 4.16 (d, J=8.7 Hz, 1H), 3.87 (br d, J=12.4 Hz, 2H), 3.47-3.42 (m, 4H), 2.95-2.73 (m, 3H), 2.62-2.53 (m, 2H), 2.50 (m, 4H), 2.21 (br d, J=6.4 Hz, 2H), 2.07-1.98 (m, 1H), 1.85-1.71 (m, 3H), 1.30 (s, 6H), 1.24 (s, 6H), 1.24-1.11 (m, 2H); HRMS calcd for C48H52N8O6 m/z 836.4010, obsd 837.4094 [M+H]⁺.

Example 7: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide (2-22)

This compound was prepared using the similar method as described in the synthesis of 2-13. The crude product was purified by preparative HPLC to give the title compound (33 mg, 23%). LC/MS: 854.5 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.11 (s, 1H), 9.12 (d, J=3.1 Hz, 1H), 8.75 (d, J=8.1 Hz, 1H), 8.32 (d, J=8.2 Hz, 1H), 7.83-7.75 (m, 3H), 7.75-7.61 (m, 2H), 7.53-7.27 (m, 2H), 7.12 (t, J=8.5 Hz, 1H), 6.98 (d, J=8.3 Hz, 1H), 5.10 (dd, J=12.6, 5.0 Hz, 1H), 4.51 (s, 1H), 4.18 (d, J=8.1 Hz, 1H), 3.62-3.40 (m, 6H), 3.12 (br, 2H), 2.96-2.87 (m, 1H), 2.79 (t, J=11.2 Hz, 2H), 2.66-2.55 (m, 2H), 2.14-1.71 (m, 4H), 1.31 (s, 6H), 1.25 (s, 6H), 1.25-1.10 (m, 2H). 4H overlapped with DMSO-d6 and were not assigned.

Example 8: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide (2-32)

Step 1: Preparation of tert-butyl (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoate

To a solution of tert-butyl 3-fluoro-4-(4-formylpiperidin-1-yl)benzoate (31 mg, 0.1 mmol) and intermediate 1-4 (48.6 mg, 0.1 mmol) in DCM (2 mL) stirred under nitrogen at room temperature was added magnesium sulphate (240 mg, 2 mmol) and triethylamine (20 mg, 0.2 mmol). The reaction mixture was stirred at room temperature for 1 hour. Then NaBH(OAc)₃ (53 mg, 0.25 mmol) was added in portions. The reaction was stirred for 1 hour. The solvent was removed in vacuum to give a crude product which was purified by silica gel column chromatography (eluted with 0-15% MeOH in DCM) to give the title compound (60 mg, 96%). LC/MS: 619.8 [M+H]⁺.

Step 2: Preparation of (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoic acid

To the solution of (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoate (60 mg, 0.09 mmol) in DCM (2 mL) was added TFA (0.4 mL). The reaction was stirred overnight. The solvent was removed in vacuum to give a crude product (55 mg, 100%). LC/MS: 563.7 [M+H]⁺.

Step 3: Preparation of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide (2-32)

To a solution of (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoic acid (55 mg, 0.09 mmol) and intermediate 1-1 (34 mg, 0.1 mmol) in DMF (2 mL) stirred under nitrogen at room temperature was added HATU (57 mg, 0.15 mmol) and DIEA (39 mg, 0.3 mmol). The reaction mixture was stirred at room temperature for 3 hours. The solvent was removed in vacuum to give a crude product, which was further purified by flash column chromatography to afford N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide as a solid (39 mg, 51%). LC/MS: 841.5 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 10.97 (s, 1H), 9.12 (dd, J=4.2, 1.7 Hz, 1H), 8.75 (dd, J=8.5, 1.6 Hz, 1H), 8.32 (d, J=8.3 Hz, 1H), 7.83-7.73 (m, 2H), 7.72-7.62 (m, 2H), 7.54 (d, J=8.1 Hz, 1H), 7.15-7.03 (m, 3H), 6.97 (d, J=8.4 Hz, 1H), 5.06 (dd, J=13.2, 5.0 Hz, 1H), 4.50 (s, 1H), 4.34 (d, J=16.8 Hz, 1H), 4.22 (d, J=16.8 Hz, 1H), 4.17 (d, J=8.8 Hz, 1H), 3.50 (br d, J=11.7 Hz, 2H), 3.30 (m, 4H), 2.98-2.87 (m, 1H), 2.76 (t, J=11.2 Hz, 2H), 2.65-2.53 (m, 5H), 2.45-2.30 (m, 1H), 2.26 (br d, J=6.8 Hz, 2H), 2.02-1.93 (m, 1H), 1.90-1.80 (m, 2H), 1.80-1.70 (brs, 1H), 1.31 (s and m, 7H), 1.24 (s and m, 7H); HRMS calcd for C48H53FN8O5 m/z 840.4123, obsd 841.4221 [M+H]⁺.

Example 9: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinamide (2-29)

Compound 2-29 was prepared using the similar method as for the preparation of 2-32. LC/MS: 823.7 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 10.97 (s, 1H), 9.12 (dd, J=4.0, 2.0 Hz, 1H), 8.75 (dd, J=8.5, 1.6 Hz, 1H), 8.66 (s, 1H), 8.32 (d, J=8.3 Hz, 1H), 7.97 (d, J=8.0 Hz, 1H), 7.76 (m, 1H), 7.66 (d, J=8.0 Hz, 1H), 7.54 (d, J=8.0 Hz, 1H), 7.14-7.03 (m, 2H), 6.98 (d, J=8.0 Hz, 1H), 6.87 (d, J=8.8 Hz, 1H), 5.07 (dd, J=13.0, 5.0 Hz, 1H), 4.49 (s, 1H), 4.43 (br d, J=11.7 Hz, 2H), 4.34 (d, J=16.8 Hz, 1H), 4.22 (d, J=16.8 Hz, 1H), 4.17 (d, J=8.7 Hz, 1H), 3.30 (br s, 4H), 2.98-2.80 (m, 3H), 2.70-2.50 (m, 4H), 2.45-2.30 (m, 2H), 2.20 (br d, 2H), 2.01-1.78 (m, 4H), 1.31 (s, 6H), 1.24 (s, 6H), 1.24-1.03 (in, 2H); HRMS calcd for C47H53N9O5 m/z 823.4170, obsd 824.4475 [M+H]⁺.

Example 10: Synthesis of N-(1,3-trans)₃((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)pyrimidine-5-carboxamide (2-30)

Compound 2-30 was prepared using the same method as for the preparation of 2-32. LC/MS: 824.5 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 10.98 (1, 1H), 8.83 (s, 1H), 8.75 (dd, J=8.4 Hz, 1H), 8.31 (d, J=8.5 Hz, 1H), 7.93 (m, 1H), 7.76 (m, 1H), 7.68-7.45 (m, 2H), 7.23-7.05 (m, 2H), 6.98 (d, J=8.4 Hz, 1H), 5.07 (m, 1H), 4.76 (br d, J=12.0 Hz, 2H), 4.52 (s, 1H), 4.36 (d, J=16.8 Hz, 1H), 4.23 (d, J=16.8 Hz, 1H), 4.16 (d, J=8.6 Hz, 1H), 3.30-3.26 (m, 4H), 3.15-2.80 (m, 3H), 2.70-2.54 (m, 2H), 2.47-2.30 (m, 4H), 2.22 (m, 2H), 2.05-1.75 (m, 4H), 1.35-1.05 (m, 14H). HRMS calcd for C46H52N10O5 m/z 824.4122, obsd 825.4199 [M+1]⁺.

Example 11: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)pyridazine-3-carboxamide (2-31)

Compound 2-31 was prepared using the similar method as for the preparation of 2-32. LC/MS: 825.5 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 10.96 (s, 1H), 9.11 (dd, J=4.2, 1.5 Hz, 1H), 8.76 (d, J=8.5 Hz, 1H), 8.35-8.27 (m, 2H), 7.85 (d, J=9.5 Hz, 1H), 7.79-7.75 (m, 1H), 7.58-7.50 (m, 1H), 7.42-7.35 m, 1H), 7.17-7.03 (m, 2H), 7.01 (d, J=8.4 Hz, 1H), 5.06 (dd, J=13.2, 4.8 Hz, 1H), 4.61 (s, 1H), 4.52 (d, J=13.0 Hz, 2H), 4.34 (d, J=17.0 Hz, 1H), 4.22 (d, J=17.1 Hz, 1H), 4.14 (d, J=9.1 Hz, 1H), 3.30-3.26 (m, 4H), 3.20-3.03 (m, 2H), 2.96-2.84 (m, 1H), 2.68-2.53 (m, 5H), 2.43-2.32 (m, 1H), 2.22 (m, 2H), 2.02-1.78 (m, 4H), 1.32-1.08 (m, 14H); HRMS calcd for C46H52N10O5 m/z 824.4122, obsd 825,4214 [M+H]⁺.

Example 12: Synthesis N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)pyridazine-3-carboxamide (2-35)

Compound 2-35 was prepared using the similar method as for the preparation of 2-32, and Intermediate 1-5 was used in the reductive amination step. LC/MS: 856.4 [M+1]⁺; ¹H NMR (400 MHz, DMSO) δ 11.12 (s, 1H), 9.11 (dd, J=4.2, 1.6 Hz, 1H), 8.76 (dd, J=8.5, 1.5 Hz, 1H), 8.31 (dd, J=8.7, 3.4 Hz, 2H), 7.84 (d, J=9.6 Hz, 1H), 7.79-7.72 (m, 2H), 7.47 (d, J=6.8 Hz, 1H), 7.38 (d, J=9.5 Hz, 1H), 7.01 (d, J=8.4 Hz, 1H), 5.12 (dd, J=12.8, 5.3 Hz, 1H), 4.61 (s, 1H), 4.52 (d, J=12.8 Hz, 2H), 4.12 (d, J=9.1 Hz, 1H), 3.27 (br s, 4H), 3.05 (t, J=11.9 Hz, 2H), 2.89-2.55 (m, 1H), 2.70-2.52 (m, 6H), 2.28-2.20 (m, 2H), 2.11-2.01 (m, 1H), 1.99-1.75 (m, 3H), 1.31 (s, 6H), 1.23 (s, 6H), 1.19-1.13 (m, 2H). HRMS calcd for C46H49FN10O6 m/z 856.3821, obsd 857.3925.

Example 13: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)nicotinamide (2-36)

Compound 2-36 was prepared using the similar method as for the preparation of 2-32, and Intermediate 1-5 was used in the reductive amination step. LC/MS: 855.5 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.13 (s, 1H), 9.12 (dd, J=4.4, 1.7 Hz, 1H), 8.75 (dd, J=8.4, 1.7 Hz, 1H), 8.66 (s, 1H), 8.32 (d, J=8.4 Hz, 1H), 7.99 (m, 1H), 7.85-7.69 (m, 3H), 7.47 (d, J=8.7 Hz, 1H), 6.99 (d, J=8.8 Hz, 1H), 6.87 (m, 1H), 5.16-5.09 (m, 1H), 4.51 (s, 1H), 4.44 (d, J=12.0 Hz, 2H), 4.17 (d, J=9.2 Hz, 1H), 3.84-3.58 (m, 2H), 3.27 (br s, 4H), 3.00-2.83 (m, 3H), 2.75-2.50 (m, 4H), 2.22 (br d, 2H), 2.11-1.95 (m, 2H), 1.90-1.77 (m, 2H), 1.31 (s, 6H), 1.24 (s, 6H), 1.24-1.05 (m, 2H). HRMS calcd for C47H50FN9O6 m/z 855.3868, obsd 856.3931 [M+1]⁺.

Example 14: Synthesis of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-(2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)benzamide (2-43)

Step 1: Preparation of tert-butyl 4-(4-(2-hydroxyethyl)piperidin-1-yl)benzoate

A solution of tert-butyl 4-fluorobenzoate (200 mg 1.02 mmol), 2-(piperidin-4-yl)ethanol (131.6 mg 1.02 mmol), potassium carbonate (422.6 mg 3.06 mmol) in DMF (5 mL) was stirred under nitrogen at 100° C. for 18 hours. The reaction mixture was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (MeOH:dichloromethane=1:10) to afford the target compound (210 mg, 0.69 mmol, 67% yield) as white solid. LC/MS: 306 [M+H]⁺.

Step 2: Preparation of tert-butyl 4-(4-(2-oxoethyl)piperidin-1-yl)benzoate

A mixture of tert-butyl 4-[4-(2-hydroxyethyl)piperidin-1-yl]benzoate (200 mg, 0.69 mmol) and IBX (218.42 mg 0.78 mmol) in DMSO (4 mL) was stirred at 50° C. under nitrogen for 18 hours. The reaction mixture was treated with 20 mL of water and extracted with EtOAc (3×5 mL). The combined organic phase was washed with water (5 mL), dried over MgSO₄ and concentrated in vacuo. The residue was purified by silica gel column chromatography (EA:dichloromethane=1:5) to afford the target compound (150 mg, 0.49 mmol, 72% yield) as a grey solid. LC/MS: 304.0 [M+H]⁺.

Step 3: Preparation of tert-butyl 4-(4-(2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)benzoate

To a mixture of tert-butyl 4-[4-(2-oxoethyl)piperidin-1-yl]benzoate (150 mg, 0.49 mmol), DIPEA (63.9 mg, 0.49 mmol), Intermediate 1-2 (187.4 mg, 0.49 mmol) and MgSO₄ (300 mg) in dichloromethane (3 mL) was added NaHB(OAc)₃ (314.4 mg, 1.48 mmol). The mixture was stirred at 25° C. for 18 hours. The residue was diluted with water (50 mL) and extracted with dichloromethane (50 mL×3). The combined organic layers were dried with anhydrous sodium sulfate, filtered and concentrated in vacuum. The residue was purified by reverse phase preparative HPLC to give the desired compound as a yellow solid (240 mg, 0.38 mmol, 78% yield). LC/MS: 630.3 [M+H]⁺.

Step 4: Preparation of 4-(4-(2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)benzoic acid

A mixture of tert-butyl 4-(4-(2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)benzoate (240 mg, 0.38 mmol) in DCM (5 mL) and TFA (0.5 mL) was stirred at 25° C. for 18 hours. The reaction mixture was concentrated under reduced pressure to afford the target compound (220 mg, 0.38 mmol, 100% yield) as yellow solid. LC/MS: 574.2 [M+H]⁺.

Step 5: Preparation of N-(1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-(2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)benzamide (2-43)

To a mixture of 4-(4-(2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)ethyl)piperidin-1-yl)benzoic acid (100 mg, 0.17 mmol), Intermediate 1-1 (56.44 mg, 0.17 mmol), DIEA (87.88 mg, 0.68 mmol) in DMF (5 mL) was added HATU (84.03 mg, 0.22 mmol) portion-wise. The resulting mixture was stirred at 25° C. for 18 hours. The reaction mixture was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (NH₃:MeOH:dichloromethane=1:10:100) to afford the target compound (50 mg, 0.06 mmol, 35% yield) as brown solid. LC/MS: 852.1 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.10 (s, 1H), 9.12 (dd, J=4.2, 1.7 Hz, 1H), 8.75 (dd, J=8.5, 1.7 Hz, 1H), 8.32 (d, J=8.2 Hz, 1H), 8.20 (br, 1H), 7.76 (m, 2H), 7.69 (m, 1H), 7.57 (d, J=9.2 Hz, 1H), 7.36 (m, 1H), 7.28 (m, 1H), 6.97 (m, 3H), 5.09 (dd, J=12.8, 5.3 Hz, 1H), 4.50 (s, 1H), 4.17 (d, J=9.2 Hz, 1H), 3.87 (d, J=12.6 Hz, 2H), 3.71-3.54 (m, 2H), 3.52-3.38 (m, 2H), 3.15 (td, J=11.6, 7.4 Hz, 2H), 2.96-2.83 (m, 1H), 2.78 (t, J=11.5 Hz, 2H), 2.68-2.53 (m, 4H), 2.45-2.29 (m, 2H), 2.10-1.94 (m, 1H), 1.78 (br d, J=12.5 Hz, 2H), 1.59-1.38 (m, 3H), 1.32-1.10 (m, 14H). HRMS calcd for C49H54N8O6 m/z 850.4166, obsd 851.4273 [M+H]⁺.

Example 15: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)benzamide (2-47)

Compound 2-47 was prepared using the similar method as for the preparation of 2-32, and Intermediate 1-5 was used in the reductive amination step. LC/MS: 854.4 [M+H]⁺. 1H NMR (400 MHz, DMSO) δ 11.14 (s, 1H), 9.13 (s, 1H), 8.76 (d, J=8.4 Hz, 1H), 8.32 (d, J=8.3 Hz, 1H), 7.85-7.72 (m, 4H), 7.68-7.29 (m, 2H), 6.99 (m, 3H), 5.13 (d, J=12.1 Hz, 1H), 4.51 (s, 1H), 4.18 (d, J=8.6 Hz, 1H), 3.89 (d, J=10.7 Hz, 2H), 3.28 (br s, 4H), 2.99-2.75 (3H), 2.72-2.50 (m, 6H), 2.24 (br, 2H), 2.07 (m, 1H), 1.89-1.75 (m, 3H), 1.31 (s, 6H), 1.25 (s, 6H), 1.25-1.10 (m, 2H). HRMS calcd for C48H51FN8O6 m/z 854.3916, obsd 855.4013 [M+H]⁺.

Example 16: Synthesis N-((1,3-trans))-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide (248)

Compound 2-48 was prepared using the similar method as for the preparation of 2-32, and Intermediate 1-5 was used in the reductive amination step. LC/MS: 872.5 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.12 (s, 1H), 9.11 (dd, J=4.2, 1.6 Hz, 1H), 8.75 (d, J=8.5 Hz, 1H), 8.31 (d, J=8.3 Hz, 1H), 7.76 (m, 3H), 7.69-7.64 (m, 2H), 7.46 (d, J=7.3 Hz, 1H), 7.10 (t, J=8.7 Hz, 1H), 6.97 (d, J=8.4 Hz, 1H), 5.11 (dd, J=12.8, 5.2 Hz, 1H), 4.50 (s, 1H), 4.17 (d, J=9.1 Hz, 1H), 3.50 (d, J=11.5 Hz, 2H), 3.28 (br s, 4H), 2.95-2.82 (m, 1H), 2.75 (m, 2H), 2.68-2.51 (m, 6H), 2.22 (br d, 2H), 2.07-2.00 (m, 1H), 1.92-1.78 (m, 2H), 1.75 (s, 1H), 1.30 (s and m, 7H), 1.24 (s and m, 7H). HRMS calcd for C48H50F2N8O6 m/z 872.3821, obsd 873.3906 [M+H]⁺.

Example 17: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)benzamide (2-49)

Compound 2-49 was prepared using the same method as for the preparation of 2-32. The final compound was purified by HPLC as a TSA salt. LC/MS: 823.5 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 10.97 (s, 1H), 9.17-9.07 (m, 1H), 8.79-8.70 (m, 1H), 8.32 (d, J=8.3 Hz, 1H), 7.80-7.75 (m, 4H), 7.66-7.47 (m, 2H), 7.17-6.91 (m, 4H), 5.12-5.00 (m, 1H), 4.50 (s, 1H), 4.32 (d, J=16.8 Hz, 1H), 4.28-4.08 (m, 2H), 3.99-3.81 (m, 2H), 3.69-3.54 (m, 1H), 3.32 (br s, 4H), 3.19-3.10 (m, 1H), 3.01-2.74 (m, 3H), 2.70-2.50 (m, 3H), 2.42-2.34 (m, 1H), 2.32-2.11 (m, 2H), 2.04-1.94 (m, 1H), 1.94-1.66 (m, 3H), 1.32-1.21 (m, 14H). HRMS calcd for C48H54N8O5 m/z 822.4217, obsd 823.4302 [M+1]⁺.

Example 18: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)pyrimidine-5-carboxamide (2-50)

Compound 2-50 was prepared using the similar method as for the preparation of 2-32, and Intermediate 1-5 was used in the reductive amination step. LC/MS: 856.6 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.13 (s, 1H), 9.11 (d, J=2.8 Hz, 1H), 8.92-8.68 (m, 3H), 8.31 (d, J=8.2 Hz, 1H), 7.96-7.69 (m, 3H), 7.48 (br s, 1H), 6.98 (d, J=8.3 Hz, 1H), 5.12 (dd, J=12.6, 5.0 Hz, 1H), 4.77 (d, J=12.7 Hz, 2H), 4.47 (s, 1H), 4.15 (d, J=9.1 Hz, 1H), 3.28 (br s, 4H), 3.17-2.74 (m, 4H), 2.67-2.53 (m, 5H), 2.22 (br s, 2H), 2.11-1.99 (m, 1H), 1.92-1.79 (m, 3H), 1.31 (s, 6H), 1.24 (s, 6H), 1.16-1.02 (m, 2H). HRMS calcd for C46H49FN10O6 m/z 856.3821, obsd 857.3902 [M+H]⁺.

Example 19: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-5-fluoronicotinamide (2-52)

Compound 2-52 was prepared using the similar method as for the preparation of 2-32. LC/MS: 873.6 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 11.13 (s, 1H), 9.12 (dd, J=4.2, 1.7 Hz, 1H), 8.75 (dd, J=8.5, 1.7 Hz, 1H), 8.53 (s, 1H), 8.31 (d, J=8.8 Hz, 1H), 7.91 (d, J=15.0 Hz, 1H), 7.83-7.73 (m, 3H), 7.47 (d, J=7.1 Hz, 1H), 6.98 (d, J=8.4 Hz, 1H), 5.12 (dd, J=12.6, 5.4 Hz, 1H), 4.49 (s, 1H), 4.27-4.16 (m, 3H), 3.27 (br s, 4H), 3.04-2.84 (m, 3H), 2.69-2.52 (m, 6H), 2.23 (br d, 2H), 2.06-2.02 (m, 1H), 1.90-1.75 (m, 3H), 1.31 (s, 6H), 1.24 (s, 6H), 1.24-1.18 (m, 2H). HRMS calcd for C47H49F2N9O6 m/z 873.3774, obsd 874.4107 [M+H]⁺.

Example 20: Synthesis of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide (2-53)

Step 1: Preparation of tert-butyl (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoate

To a solution of tert-butyl 3-fluoro-4-(4-formylpiperidin-1-yl)benzoate (100 mg, 0.33 mmol) in DCM (20 mL) stirred under argon at room temperature was added Intermediate 1-3 (166.5 mg, 0.33 mmol), MgSO₄ (396 mg, 3.3 mmol) and TEA (200 mg, 1.98 mmol). The reaction mixture was stirred at room temperature for 30 minutes. To the reaction mixture was added sodium triacetoxyborohydride (175 mg, 0.825 mmol). The reaction mixture was stirred at room temperature for 2 hours. The solution was filtered, the filtrate was concentrated. The residue was purified via Prep-TLC (DCM/MeOH=20:1) to afford tert-butyl (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoate. (100 mg, 47.5%). LC/MS: 637.6 [M+H]⁺.

Step 2: Preparation of (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoic acid

To a solution of tert-butyl (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoate (100 mg, 0.157 mmol) in DCM (5 mL) stirred at room temperature was added TFA (3 mL). The reaction mixture was stirred at room temperature for 2 hours. The crude product was concentrated in vacuum and used directly to next step. LC/MS: 581.7 [M+H]⁺.

Step 3: Preparation of N-((1,3-trans)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4-((4-(2-((S)-2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide (2-53)

To a solution of (S)-4-(4-((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzoic acid (100 mg, 0.17 mmol) in DMF (5 mL) stirred under argon at room temperature was added HATU (97 mg, 0.255 mmol), Intermediate 1-1 (56.4 mg, 0.17 mmol) and DIEA (132 mg, 1.02 mmol). The reaction mixture was stirred at room temperature overnight. The crude product was concentrated in vacuum. The residue was extracted with DCM (3×20 mL) and purified via Prep-TLC (DCM/MeOH=10:1) to give the title compound as white solid (59 mg, 38.9%). LC/MS: 858.6 [M+H]⁺; ¹H NMR (400 MHz, DMSO) δ 10.99 (s, 1H), 9.11 (dd, J=4.4, 1.7 Hz, 1H), 8.75 (dd, J=8.4, 1.7 Hz, 1H), 8.31 (d, J=8.4 Hz, 1H), 7.81-7.64 (m, 4H), 7.47-7.35 (m, 1H), 7.30-7.18 (m, 1H), 7.15-7.05 (m, 1H), 6.97 (d, J=8.4 Hz, 1H), 5.15-5.05 (m, 1H), 4.50 (s, 1H), 4.38 (d, J=16.4 Hz, 1H), 4.25 (d, J=16.4 Hz, 1H), 4.17 (d, J=9.2 Hz, 1H), 3.70-3.55 (m, 2H), 3.55-3.45 (m, 2H), 3.32-3.24 (m, 1H), 3.14 (br s, 3H), 2.95-2.87 (m, 1H), 2.81-2.71 (m, 2H), 2.65-2.55 (m, 3H), 2.47-2.30 (m, 1H), 2.26 (br d, 2H), 2.10-1.95 (m, 2H), 1.90-1.75 (m, 2H), 1.31 (s, 7H), 1.24 (s, 7H). HRMS calcd for C48H52F2N805 m/z 858.4029, obsd 859.4251 [M+H]⁺.

Testing of compounds for AR Degradation Activity

LNCAP, VCAP and 22Rv1 cells were plated in 24-well plates at 1.5×10E5 cells/well in the RPMI growth medium containing 10% FBS and 1% Penicillin Streptomycin, and then incubated at 37° C. overnight. The following day, the test compound was administered to the cells by using 1000× compound stock solution prepared in DMSO at various concentrations. After administration of the compound, the cells were then incubated at 37° C. for 24 hours. Upon completion, the cells were washed with PBS and protein was collected in Laemmli sample buffer (1×; VWR International). Proteins in cell lysate were separated by SDS-PAGE and transferred to Odyssey nitrocellulose membranes (Licor) with Iblot® dry blotting transfer system (ThermoFisher). Nonspecific binding was blocked by incubating membranes with Intercept Blocking Buffer (Licor) for 1 hour at room temperature with gentle shaking. The membranes were then incubated overnight at 4° C. with Primary antibodies rabbit anti-AR (1:1,000, Cell Signaling, 5153) and mouse anti-GAPDH (1:5,000, Santa Cruz Biotechnology, sc-47724) diluted in Intercept Blocking Buffer containing 0.1% Tween 20. After washing 3 times with TBS-T, the membranes were incubated with IRDye® 800CW goat anti-mouse IgG (1:20,000, Licor) or IRDye® 800CW goat anti-rabbit IgG (1:20,000, Licor) for 1 hour. After TBS-T washes, membranes were rinsed in TBS and scanned on Odyssey® CLx Imaging System (Licor). The bands were quantified using Image Studio™ Software (Licor).

Cell growth inhibition for Ramos cells

RAMOS cells (ATCC) were seeded in 96-well plates at 16,000 cell/well in 90 μl of RPMI growth medium containing 10% Heat-Inactivated Fetal Bovine Serum and 1% Penicillin/Streptomycin. The test compound was administered to the cells by using 10× compound stock solution prepared in growth medium at various concentrations. After administration of the compound, cells were then incubated at 37° C. for 3 days. Before CellTiter-Glo assay, the plates were equilibrated at room temperature for approximately 10 minutes. 100 ul of CellTiter-Glo® Reagent (Promega) was added to each well. The plates were then incubated at room temperature for 10 minutes and luminescence was recorded by EnSpire plate reader (PerkinElmer).

Cell Growth Inhibition for VCAP Cells

VCAP cells (ATCC) were seeded in 96-well plates at 3000 cell/well in 80 μl of DMEM growth medium containing 10% charcoal-stripped FBS (CSS) and 1% Penicillin/Streptomycin. Cells were incubated at 37° C. overnight. The following day, the test compound was administered to the cells by using 10× compound stock solution prepared in growth medium at various concentrations. Four hours later, 0.1 nM R1881 (Sigma) was administered to the cells by using 10× compound stock solution prepared in growth medium. 0.1% DMSO with or without 0.1 nM R1881 was administered as control. Cells were then incubated at 37° C. for 6 days. Before CellTiter-Glo assay, the plates were equilibrated at room temperature for approximately 10 minutes. 100 ul of CellTiter-Glo® Reagent (Promega) was added to each well. The plates were then incubated at room temperature for 10 minutes and luminescence was recorded by EnSpire plate reader (PerkinElmer).

Table 4 summarizes the androgen receptor (AR) degradative activity and cell growth inhibition of exemplary compounds in (a) LNCAP, VCAP, and 22Rv1 cell lines 24 hours after administration of the compound; (b) RAMOS cell line 3 days after administration of the compound; and (c) VCAP cell line 6 days after administration of the compound. DC50: compound concentration needed for 50% target protein degradation.

TABLE 4 AR degradative activity of compounds from cellular assays AR degradation Cell growth inhibition LNCAP VCAP 22Rv1 VCAP RAMOS Compound (DC50, (DC50, (DC50, (GI50, (GI50, reference # nM) nM) nM) nM) nM) 2-43 2 1.8 N/A 31.2 >3,000 2-21 2.2 1.2 0.9 18 >3,000 2-13 0.7 0.7 N/A 47.6 >3,000 2-32 0.1 0.3 0.25 5.7 >3,000 2-30 0.2 N/A N/A 11.5 >3,000 2-49 0.4 0.4 0.4 8.2 >3,000 2-29 0.1 N/A 0.13 2.1 >3,000 2-31 0.6 N/A N/A 9.2 >3,000 2-51 0.5 N/A N/A 11 >3,000 2-19 0.5 1 N/A N/A N/A 2-18 0.4 0.4 N/A N/A N/A 2-22 1 1.7 2.8 8 N/A 2-36 1.4 N/A N/A N/A N/A 2-47 0.8 N/A N/A N/A N/A 2-48 3.8 N/A N/A N/A N/A 2-50 0.6 N/A N/A N/A N/A 2-35 0.4 N/A N/A N/A N/A 2-52 1.3 N/A N/A N/A N/A| 2-9 0.2 N/A N/A N/A N/A 2-11 2.8 N/A N/A N/A N/A 2-53 0.4 N/A N/A 11.9 N/A

The many features and advantages of the present disclosure are apparent from the detailed specification, and thus it is intended by the appended claims to cover all such features and advantages of the present disclosure that fall within the true spirit and scope of the present disclosure. Further, since numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the present disclosure to the exact construction and operation illustrated and described and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the present disclosure.

Moreover, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be used as a basis for designing other structures, methods, and systems for carrying out the several purposes of the present disclosure. Accordingly, the claims are not to be considered as limited by the foregoing description or examples. 

What is claimed is:
 1. A compound of Formula (1) or a pharmaceutically acceptable salt thereof:

wherein: X₁ is CR₁ or N; X₂ is CR₂ or N; X₃ is CR₃ or N; X₄ is CR₄ or N; each of R₁, R₂, R₃, and R₄ is independently selected from hydrogen, halogen, C₁-C₃alkoxy, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S); each R₅ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN, each of which is substituted with 0, 1, 2, or 3 R_(S); each R₆ is independently selected from hydrogen, halogen, C₁-C₃alkyl, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₆ groups are taken together to form an oxo; each R₇ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN, each of which is substituted with 0, 1, 2, or 3 R_(S); each R₈ is independently selected from hydrogen, hydroxyl, C₁-C₃alkyl, and C₁-C₃haloalkyl, each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₈ groups are taken together to form an oxo; each R₉ is independently selected from hydrogen, C₁-C₃alkyl, —C(═O)—(C₁-C₃alkyl), —C(═O)—O—(C₁-C₃alkyl), and —C(═O)—NH—(C₁-C₃alkyl), each of which is substituted with 0, 1, 2, or 3 R_(S), or two R₉ groups are taken together to form a 3- to 6-membered heterocycle or heteroaryl; each R_(S) is independently selected from halogen, hydroxyl, C₁-C₃alkyl, C₁-C₃alkoxy, C₁-C₃haloalkyl, —N(R₉)₂, and —CN; L is a linker of 1 to 16 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S); m is 0, 1, or 2; n is 0, 1, 2, or 3; and o is 0, 1, 2, or 3, wherein each hydrogen atom is independently and optionally replaced by a deuterium atom.
 2. The compound or pharmaceutically acceptable salt thereof according to claim 1, wherein X₁ is N.
 3. The compound or pharmaceutically acceptable salt thereof according to claim 1 or 2, wherein X₂ is N.
 4. The compound or pharmaceutically acceptable salt thereof according to claim 1, wherein X₁ and X₂ are each N.
 5. The compound or pharmaceutically acceptable salt thereof according to claim 1 or 2, wherein X₂ is CR₂, X₃ is CR₃, and X₄ is CR₄.
 6. The compound or pharmaceutically acceptable salt thereof according to claim 5, wherein R₂, R₃, and R₄ are each independently selected from H and F.
 7. The compound or pharmaceutically acceptable salt thereof according to claim 1, wherein X₁ is CR₁, X₂ is CR₂, X₃ is CR₃, and X₄ is CR₄.
 8. The compound or pharmaceutically acceptable salt thereof according to claim 7, wherein R₁, R₂, R₃, and R₄ are each independently selected from H and F.
 9. The compound or pharmaceutically acceptable salt thereof according to claim 7 or 8, wherein R₁ is F.
 10. The compound or pharmaceutically acceptable salt thereof according to claim 7 or 8, wherein R₂ is F.
 11. The compound or pharmaceutically acceptable salt thereof according to claim 7 or 8, wherein R₃ is F.
 12. The compound or pharmaceutically acceptable salt thereof according to claim 7 or 8, wherein R₄ is F.
 13. The compound or pharmaceutically acceptable salt thereof according to claim 7 or 8, wherein R₁ and R₃ are each F.
 14. The compound or pharmaceutically acceptable salt thereof according to claim 7 or 8, wherein R₃ and R₄ are each F.
 15. The compound or pharmaceutically acceptable salt thereof according to claim 9, wherein R₂, R₃, and R₄ are each H.
 16. The compound or pharmaceutically acceptable salt thereof according to claim 10, wherein R₁, R₃, and R₄ are each H.
 17. The compound or pharmaceutically acceptable salt thereof according to claim 11, wherein R₁, R₂, and R₄ are each H.
 18. The compound or pharmaceutically acceptable salt thereof according to claim 12, wherein R₁, R₂, and R₃ are each H.
 19. The compound or pharmaceutically acceptable salt thereof according to claim 13, wherein R₂ and R₄ are each H.
 20. The compound or pharmaceutically acceptable salt thereof according to claim 14, wherein R₁ and R₂ are each H.
 21. The compound or pharmaceutically acceptable salt thereof according to claim 1, wherein the

group is selected from


22. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 21, wherein each R₅ is independently selected from halogen, C₁-C₃alkoxy, and C₁-C₃haloalkyl.
 23. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 22, wherein each R₅ is independently selected from —Cl, —OCH₃, and —CF₃.
 24. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 23, wherein m is 0 or
 1. 25. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 24, wherein m is
 0. 26. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 25, wherein m is
 1. 27. The compound or pharmaceutically acceptable salt according to any one of claims 1 to 26, wherein o is
 0. 28. The compound or pharmaceutically acceptable salt according to any one of claims 1 to 26, wherein o is
 1. 29. The compound or pharmaceutically acceptable salt according to any one of claims 1 to 23, wherein m and o are each
 0. 30. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 29, wherein each R₆ is independently selected from H and C₁-C₃alkyl.
 31. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 30, wherein each R₆ is independently selected from H and —CH₃.
 32. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 31, wherein the two R₆ groups attached to the same carbon are identical.
 33. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 31, wherein each R₆ is identical.
 34. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 31, wherein each R₆ is different.
 35. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 34, wherein the

group is selected from


36. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 34, wherein the

group is selected from


37. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 36, wherein each R₇ is independently selected from halogen, hydroxyl, C₁-C₃alkyl, and C₁-C₃haloalkyl.
 38. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 37, wherein each R₇ is independently selected from halogen, hydroxyl, —CH₃, and —CF₃.
 39. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 38, wherein each R₇ is independently selected from F, hydroxyl, —CH₃, and —CF₃.
 40. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 39, wherein each R₇ is independently F.
 41. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 37, wherein n is
 0. 42. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 37, wherein n is
 1. 43. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 42, wherein each R₈ is hydrogen or two R₈ groups are taken together to form an oxo.
 44. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 42, wherein each R₈ is hydrogen.
 45. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 42, wherein two R₈ groups are taken together to form an oxo.
 46. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 45, wherein each R₉ is independently selected from hydrogen, C₁-C₃alkyl, and —C(═O)—C₁-C₃alkyl.
 47. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 46, wherein each R₉ is independently selected from hydrogen and C₁-C₃alkyl.
 48. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 47, wherein each R₉ is independently selected from hydrogen, —CH₃, —CH₂CH₃, and —CH(CH₃)₂.
 49. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 36, wherein the

group is selected from


50. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 49, wherein L is a linker of 1 to 12 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S).
 51. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 50, wherein L is a linker of 1 to 10 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S).
 52. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 51, wherein L is a linker of 1 to 8 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S).
 53. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 52, wherein L is a linker of 1 to 6 carbon atoms in length, wherein one or more carbon atoms are optionally replaced by C(═O), O, N(R₉), S, C₂-alkenyl, C₂-alkynyl, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S).
 54. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 53, wherein one or more carbon atoms of linker L are optionally replaced by C(═O), O, N(R₉), S, cycloalkyl, aryl, heterocycle, or heteroaryl, wherein the R₉, C₂-alkenyl, cycloalkyl, aryl, heterocycle, and heteroaryl are each independently substituted with 0, 1, 2, or 3 R_(S).
 55. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 54, wherein one or more carbon atoms of linker L are optionally replaced by O, N(R₉), cycloalkyl, or heterocycle, wherein the R₉, cycloalkyl, and heterocycle are each independently substituted with 0, 1, 2, or 3 R_(S).
 56. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 55, wherein at least one carbon atom of linker L is replaced by a heterocycle, which is substituted with 0, 1, 2, or 3 R_(S).
 57. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 55, wherein at least two carbon atoms of linker L are replaced by a heterocycle, each of which is substituted with 0, 1, 2, or 3 R_(S).
 58. The compound or pharmaceutically acceptable salt thereof according to claim 56 or 57, wherein the heterocycle is selected from piperidine and piperazine, each of which is substituted with 0, 1, 2, or 3 R_(S).
 59. The compound or pharmaceutically acceptable salt thereof according to claim 56 or 57, wherein the heterocycle is selected from


60. The compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 49, wherein L is selected from:


61. The compound according to claim 1, wherein the compound is chosen from:  1 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-((5- ((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)pentyl)oxy)benzamide;  2 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(3- (3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)propoxy)propoxy)benzamide;  3 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(2- (4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethoxy)benzamide  4 N-((1r,3r)-3-((8-oyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(3- (4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) propoxy)benzamide  5 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) butoxy)benzamide  6 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-((5- (4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) pentyl)oxy)benzamide  7 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) nicotinamide  8 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)cyclobutyl)(methyl)amino)butoxy)benzamide  9 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)cyclobutyl)(methyl)amino)methyl)piperidin-1-yl)nicotinamide 10 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-,3-dioxoisoindolin-5-yl) oxy)cyclobutyl)(ethyl)amino)methyl)piperidin-1-yl)nicotinamide 11 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinamide 12 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((((1s,3s)-3-((2-(2,6-dioxopipendin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)nicotinamide 13 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)nicotinamide 14 N-((1S,3S)-3-((8-cyanoquinolin-5-yl)oxy)-2,2-dimethylcyclobutyl)-6-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)nicotinamide 15 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)cyclobutyl)-6-(4-((4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl) nicotinamide 16 N-((1s,3s)-3-((8-cyanoquinolin-5-yl)oxy)cyclobutyl)-6-(4-((4-(2-(2,6- dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl) nicotinamide 17 N-((1S,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2-dimethylcyclobutyl)-6-(4-((4-(2- (2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)nicotinamide 18 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyrimidine-5-carboxamide 19 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyridazine-3-carboxamide 20 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-5-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyrazine-2-carboxamide 21 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)benzamide 22 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-3-fluorobenzamide 23 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethyl)piperazin-1-yl)-3-fluorobenzamide 24 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethyl)piperidin-1-yl)-3-fluorobenzamide 25 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethyl)piperidin-1-yl)nicotinamide 26 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4- (2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethyl)piperidin-1-yl)pyrimidine-5-carboxamide 27 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethyl)piperidin-1-yl)pyridazine-3-carboxamide 28 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (2-(4-(2-(2,6-dioxopipendin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethyl)piperidin-1-yl)-5-fluoronicotinamide 29 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)nicotinamide 30 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4- ((4-(2-((S)-2,6-dioxopipendin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyrimidine-5-carboxamide 31 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-((S)-2,6-dioxopipendin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyridazine-3-carboxamide 32 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-((S)-2,6-dioxopipendin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-3-fluorobenzamide 33 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-((S)-2,6-dioxopipendin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)nicotinamide 34 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-((S)-2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyridazine-3-carboxamide 35 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyridazine-3-carboxamide 36 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)nicotinamide 37 N-((1r,3S)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (((2S)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)nicotinamide 38 N-((1r,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- (((2R)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)nicotinamide 39 N-((1r,3S)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((2S)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)benzamide 40 N-((1r,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((2R)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)benzamide 41 N-((1r,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((2R)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)-2- methylpiperazin-1-yl)methyl)piperidin-1-yl)benzamide 42 N-((1r,3R)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((2R)-2-((dimethylamino)methyl)-4-(2-(2,6-dioxopiperidin-3-yl)-1,3- dioxoisoindolin-5-yl)piperazin-1-yl)methyl)piperidin-1-yl)-3-fluorobenzamide 43 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (2-(4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) ethyl)piperidin-1-yl)benzamide 44 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)cyclobutyl)(isopropyl)amino)methyl)piperidin-1-yl)pyridazine-3- carboxamide 45 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- (((2-(dimethylamino)ethyl)((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3- dioxoisoindolin-5-yl)oxy)cyclobutyl)amino)methyl)piperidin-1-yl)-3- fluorobenzamide 46 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-5-fluoronicotinamide 47 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)benzamide 48 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-3-fluorobenzamide 49 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-((S)-2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)benzamide 50 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-2-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)pyrimidine-5-carboxamide 51 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-3-fluorobenzamide 52 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-6-(4- ((4-(2-(2,6-dioxopiperidin-3-yl)-6-fluoro-1,3-dioxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-5-fluoronicotinamide 53 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((4-(2-((S)-2,6-dioxopiperidin-3-yl)-6-fluoro-1-oxoisoindolin-5-yl)piperazin-1-yl) methyl)piperidin-1-yl)-3-fluorobenzamide 54 N-((1r,3r)-3-((8-cyanoquinolin-5-yl)oxy)-2,2,4,4-tetramethylcyclobutyl)-4-(4- ((((1r,3r)-3-((2-(2,6-dioxopiperidin-3-yl)-1,3-dioxoisoindolin-5-yl) oxy)cyclobutyl)(ethyl)amino)methyl)piperidin-1-yl)benzamide

or a pharmaceutically acceptable salt thereof, wherein each hydrogen is independently and optionally replaced by a deuterium.
 62. A pharmaceutical composition comprising at least one compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 61 and a pharmaceutically acceptable carrier.
 63. The pharmaceutical composition according to claim 62, wherein the compound or pharmaceutically acceptable salt thereof is present in a therapeutically effective amount.
 64. A method of treating cancer in a subject in need thereof, comprising administering to said subject a compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 61 or a pharmaceutical composition according to claim 62 or
 63. 65. The method according to claim 64, wherein the cancer is selected from prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer.
 66. The method according to claim 64 or 65, wherein the cancer is prostate cancer.
 67. The method according to any one of claims 64 to 66, wherein the cancer is androgen receptor positive.
 68. The method according to any one of claims 64 to 67, wherein the subject has been previously treated with an anti-cancer agent.
 69. The method according to claim 68, wherein the anti-cancer agent is enzalutamide, apalutamide, bicalutamide, darolutamide, flutamide, abiraterone, or a combination of any of the foregoing.
 70. The method according to claim 69, wherein the anti-cancer agent is enzalutamide.
 71. A use of a compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 61 or a pharmaceutical composition according to claim 62 or 63 for treating cancer.
 72. The use according to claim 71, wherein the cancer is selected from prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer.
 73. The method according to claim 71 or 72, wherein the cancer is prostate cancer.
 74. The method according to any one of claims 71 to 73, wherein the cancer is androgen receptor positive.
 75. A use of a compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 61 or a pharmaceutical composition according to claim 62 or 63 in the manufacture of a medicament.
 76. The use according to claim 75, wherein the medicament is for the treatment of a cancer selected from prostate cancer, head and neck cancer, skin cancer, sarcoma, renal cell carcinoma, adrenocortical carcinoma, bladder cancer, lung cancer, gastric carcinoma, esophageal carcinoma, pancreatic adenocarcinoma, colorectal cancer, connective tissue cancer, glioblastoma multiforme, cervical cancer, uterine cancer, ovarian cancer, and breast cancer.
 77. The use according to claim 76, wherein the cancer is prostate cancer.
 78. The use according to claim 76 or 77, wherein the cancer is androgen receptor positive.
 79. A method of inhibiting cell growth, comprising contacting a cell with a compound or pharmaceutically acceptable salt thereof according to any one of claims 1 to 61 or a pharmaceutical composition according to claim 62 or
 63. 80. The method according to claim 79, wherein the cell is a cancer cell.
 81. The method according to claim 80, wherein the cancer cell is a prostate cancer cell.
 82. The method according to any one of claims 79 to 81, wherein the cell is androgen receptor positive.
 83. The compound of Formula (1) according to claim 1, wherein the compound is a compound of Formula (1A) 